Neither of us want to leave the other, yet we both want to have the other see our side. Which, I think I can see his side.
Can you though? Stop for a moment and consider this... Let's say he has a total about face, and you both move forward as poly. Ignore what you might feel is implausible for a moment, and just consider the following at face value. Within a week he's dating another woman, and he's gushing to you about how much he has in common with her. He goes out with her often, and starts having sleep-overs at her place. Then comes his declaration that he has fallen in love with her. He assures you that he still wants to stay in the marriage, and doesn't get 'cold' to you. One day you come home and you can hear him on the phone talking to her. (which is OK of course) He doesn't hear you and you kind of 'step softly' so he doesn't hear you come in. You listen as he talks about how much he loves her and how much she has enriched his life.
Are you still OK with all this? Are you worry-free about it all? Or are you now beginning to see 'his side' of it? With respect, it's easy for a person on the poly side of a mono/poly relationship to say they 'understand' the concerns of the mono partner, when there is no 'threat' of losing the partner to one of their other poly partners. If they are mono, there is no jealousy on the side of the poly person. There is no one to be jealous about.
As men, we grow up learning to suppress our emotions. The 'be a man' axiom has been drilled into the heads of males for centuries. I'm not surprised he is unable to cope with this emotionally, since most men never really open up that side of themselves.
I would say that he is trying to rationalize this in his mind. He has presented discussions like splitting up but living in the basement (there is rental suite in the basement). That he wants to be my best friend even if we can’t be together. He is rationalizing everything around a monogamist framework.
I think another part of this, that you haven't mentioned yet, is how this will affect your kids. If he wants to stay in the house, he likely wants to be there for the kids as much as you. Remember, you would be the one dating other men. If you break up and he moves out, in comes (to his perspective) another 'daddy'. He not only loses you, but he may fear losing his kids too.
His level of reluctance to poly is not something I see changing anytime soon. You may need to accept that it could take years before he is 'ready' to go down that road, if at all. Are you willing to wait that long and take that chance?
We have had some very great discussions about his fears and asking what if questions. He is afraid that I’ll find someone else. This very likely comes from the belief that he isn’t enough for me.
Although I don't know him, I'm willing to speculate that he is probably a very 'logical' minded person, would you agree? However, his belief that he isn't enough for you is true. You yourself have said there was something missing in your life.
However, in your discussions, you're still talking about things from a perspective of that they COULD happen. Talk to him about things from a DID happen perspective.
He's afraid you will find someone else because you *want* to find someone else. The difference is that you want to make this person an additional partner and not a replacement partner. So do the what if, and ask questions that go PAST his reluctance.
For example, ask him to pretend that he has agreed to you becoming poly. Why don't you take the next step and try to discuss what kind of 'terms' he would accept. Reiterate that it is all pretend. Would he want a condition that the man not be brought into your home? What about a limit that this new partner is not allowed to see your kids? Would he want a limit on the number of nights per week you could go on dates? Would he want a limit on the extent of physical or sexual activity? There are all kinds of poly frameworks, some are more liberal than others. Perhaps you could discuss poly limits that he would be comfortable with. While he may find himself unable to even consider it, try to get him to pretend. Perhaps you can establish some limits that may help to assuage many of his concerns.
Remember, he knows nothing about the kinds of negotiation that can take place in a poly relationship. Why not discuss some of the things that you are willing to compromise on. Perhaps something simple like that you won't bring the other partner to the house without his prior approval. As you can imagine, being forced to look at your new partner may be 'too much' for him. So you can see if this would help him deal with that. Or maybe he wants the opposite. Maybe he would want to meet the other partner before you start dating. Try to see if you can get him to talk about what he would be comfortable with, and what he wouldn't be able to handle. Maybe you can work with that.
And in terms of what he would do if we went down this path. He is very unsure. He has been chatting with a few women, but hasn’t been honest with him about being married, etc. Which I find interesting. He is afraid of how they will react. Because it is going to be harder for him to find someone who is okay with a situation like this, than it will be for me.
Exactly. To be fair, most women will react badly if a man says he is married and looking to date. Unless they are seasoned poly veterans, they will almost always assume the guy is lying and is cheating on his wife.
You need to consider that you may need to be involved in his quest to find another partner. At the very least you will likely need to meet women to assure them that you are OK with it all. Heck, if you were shrewd, you might try to fix him up with someone. Let's be honest here... The fastest way to get him to understand poly would be for him to become poly. If you were able to get him involved with another woman, he would understand your point of view on how he can be in two relationships at once.
But let's be honest here... A woman can say she is married and very few men will object. The reverse is rarely true. This is something you will have to deal with to overcome his objections. If he goes down this road, it will be demoralizing and depressing if he is rejected by every woman he meets because he is married and they are not interested in that--while at the same time you don't have any problems at all.
Honestly, I want to have my cake and eat it too. That’s the hard part right now. I don’t want to give up my current relationship. I don’t want to watch him from afar as he continues to grow as a parent, as a person. I want to continue to experience life with him. I want to share in our experiences. Yet, I want to have the freedom to grow as and individual as well, to learn from and experience other people at a level beyond acquaintance and friend.
Do you ever find yourself feeling that you married too young? I ask since your desire is something that many people 'get out of their system' before they marry.
What I think you need to start considering is what you plan to do if he is unwilling to cross the poly line. What then? With all due respect, if I can be blunt, when you said 'I do', it was to a monogamous relationship. You made that promise to him, as he did to you, 'till death do you part'. Now, years later, you want to take back that promise and change it something else. I'm not saying this is a bad thing, and I'm not suggesting it is a betrayal or anything like that. At this point it is only talk. There is nothing wrong with that. But you did agree to the marriage. He wants to keep the promise that you both made when you got married. I don't think it is fair to put the weight of his poly reluctance on his shoulders. From his perspective, he never signed up for this. It's not about an ultimatum, it's about him wanting to keep the status quo. If you're unwilling (or unable) to do that, then your marriage is in trouble.
Your other option may be a trial separation. Perhaps if you and your husband 'took a break', while you went off and explored other men, maybe you will be able to determine what you want more--should you be forced to choose between poly and your marriage.