If you aren't inclined, you doing it could make it seem much worse than it is, because for you it is! The real issue seems to be that you don't want her dating anyone else and she will not stop and you don't want to break off so you will ignore what you want and mold yourself to her wishes.
I can tell you how this ends - she will be bored of a yes man. She will find someone who honestly likes her as she is. Eventually, she'll be done with the farce between the two of you. And you'll still be wondering what you could do to make her stay with you, when you aren't incompatible.
One thing that has come out of this for me is that I now see how opening up a relationship that may be getting a bit stagnant or caught in a bit of a rut could truly help. Perhaps 5 or 10 years into a marriage.
Mono or poly, you can't fix a relationship stagnating with having another that is shinier. You have to work on the relationship to fix it.
But to me, when we're only two years in, we're still learning about each other, our love is still growing, being open has no benefit to me whatsoever.
I don't know how that computed. You are here saying you want different things in the relationship, you're planning to wall off huge chunks of intimacy into DADT with each other, you are PLANNING to lie to each other. You are denying your own feelings on such a crucial subject because she wouldn't listen anyway. What part of that sounds like your love is growing? To me it sounds more like you are keeping a facade on till either of you finds someone to be with rather than breaking now and being single.
We are so far from being on the same page that we may as well be in different books.
or relationships
Last weekend it came to a bit of a climax where I couldn't hold it in and told her that I don't know if I can be a part of this. This immediately put us on shaky ground, as she told me that she still needs to continue on this path.
So much for growing love.
She is young and at the moment is a little unsure of who she is, and wants to explore herself and her sexuality with both men and women. I have no intentions of stopping her from doing so. I can see that this has nothing to do with us as a couple, but something that she needs to go through.
I don't know how many signs you need. Her exploring her sexuality has nothing to do with her putting a "No trespassing" board on her sexual life for you to stay out. Whether you intend to stop her or not, she doesn't appear to be inclined to stop and if her sex life is not a part of you being a couple, then I don't know what couple means. In other words, what you feel, want or allow is irrelevant to what she chooses.
We ended up deciding to take a couple of days off from speaking to think about things alone.
Your whole relationship is going through a phase where there are walls between you, and your solution to an issue in it is taking days off from speaking about it. How is this making sense to you?
In a way it helped, and also didn't. She's on a flight to come and see me as I write this and I am unsure how this weekend is going to unfold and what will be the end result.
I think this is a good time to talk the whole thing through. Instead of making absurd compromises and praying she doesn't leave you "in name only" - the rest of the leaving already seems to be done - with an option to pick if she wants to exercise it. On the other hand, if she is flying over to be able to talk to you then she may care, in which case your best bet is to be as honest as possible with what you want in the relationship. In your place I most certainly wouldn't agree to walls (DADT/lies) between us in an already stressed relationship and with her going through a major phase of self-discovery and change behind the "wall".
I feel like pride has a lot to do with me not being able to be on board with this. How can I rationalize another guy being with my girl?
You sound monogamous. If so, I don't know if this can end happily for you. What is to rationalize? He likes her, she likes him. If this sounds like a breakdown of the order of the world to you, then that is exactly what is happening. She is polyamorous. Wanting to be close to someone you find attractive is the natural order of things and is irrelevant to whether number of existing partners is zero or one or more as long as she has the time and attention to enjoy them all and hold up her end of the relationship with all.
I do understand her reasons for wanting to do this, but i just cannot figure out how to look at it in a way where I can be ok with her being with other people.
It just is. Attraction. Except the rule that in your mind says "one man one woman" doesn't exist, so she doesn't see why she shouldn't explore it. But, there is a reason, actually. If one loves their partner, they don't just go about additional relationships whether they are hurt or not. She should help you become okay or desist or end things with you before exploring additional relationships. What is going on sounds indifferent on her end and desperate on yours.
I don't even know what my biggest fear is that makes me not ok with it.
We can always sense a partner moving away from us.
Maybe that we will simply drift and she will simply end up falling for someone else.
Yes, you will, she will.
There is a nagging, annoying voice inside me that is telling me that I need to let her go, and that this is a journey that she needs to go on herself.
You know what to do. And the answer isn't tormenting yourself holding an end of a relationship not knowing what is going on on the other end. Speak with her. Seek clarity and the emotional security you need. Find a compromise both of you can live with. If it can't be reached, walk away.