That's why I agree with graviton that he doesn't need to reference his feelings for the friend in order to be honest, even "fully" honest. He hasn't acted on those feelings, and I don't believe that honesty equals sharing every last corner of your soul. We're all entitled to a little privacy, even with our spouses.
It's not like he was going along for years happily monogamous and then met this person and was like "Wow, I was happy with monogamy until I met this person. Now I feel like I'm going to die if I can't have her." No. She was just the lens that allowed him to see what was already there. It's the "what's there" that's important, not the lens that helped you discover it.
There's no need to pursue this specific relationship, despite whatever feelings you have right now. Everyone has a "messy list" -- people whom you just don't touch. I would absolutely include a spouse's best friend on that list, along with family and coworkers. No relationship is guaranteed to last forever, and the fallout between you and the best friend could have serious consequences for their friendship. That could lead to resentment from your fiancee, which could easily leave you without either one of them in your life.
Frankly, I would be less worried about that if you and your fiancee and the best friend had your gold stars in communication. But you obviously don't. You've been hiding this from her, you're scared to have an honest discussion, and she freaks out when you try to bring it up. Add in that the best friend and your wife obviously haven't discussed polyamory, despite the friend's knowledge of it. So basically, you guys are 0 for 3 on open, honest communication. With those credentials, the chances of the three of you surviving the vee experiment with all friendships intact... aren't great. It's hard enough to maintain friendships after breakups when everyone's awesome at communication. When they aren't? Forget it.
Instead focus on yourself and your lifelong inclinations. Tell her what you said about your parents' marriage, about how monogamy has never felt quite right but you didn't have a framework for any alternatives until recently. Because your inclinations have nothing, zilch, to do with the best friend. That's all about you and only you. The friend is just the lens. When you show someone a photograph, you don't show them the lens, you show them the results.
And spend some time and energy getting over the best friend. I just wouldn't go there. I wouldn't feel very good about myself if I did something that jeopardized my spouse's relationship with their best friend, knowing ahead of time that the risk was there, knowing that I could have avoided it, and then selfishly choosing to pursue it anyway.
After all, being polyamorous doesn't mean you have to pursue each and every flutter in your heart. We can control our behaviour completely, and our emotions to a large extent as well. You can open up about having polyamorist inclinations without muddying up the waters with her best friend.
Thank you. All of your advice was excellent. I wish I had read it before having the earlier conversations.
Yes, you are right that best friend, let's call her Annie, is just the lens through which I discovered and identified something in myself. But I'm also deeply in love with her. Can't stop thinking about her, pit of the stomache in love. Off and on, Going on at least a year now.
That said, fiancé-now-wife, let's call her Joy, is still the face I want to wake up to, take care of, love, protect, provide for, spend my life with, etc.
I've come to the realization that I may only get to have a physical relationship with my wife, but she understands that I love Annie too.
I don't think she totally understands, or wants to understand; that in a perfect world I would love and provide and celebrate love and life with both of them as completely as I am capable of.
But maybe we will get there someday.
Sometimes she says weird things out of the blue that make me think she gets it fully somewhere inside, but i never know what to make of them.
I openly tell them both I love them, and Joy is fine with that.
In private moments on special occasions Annie and I tell each other we love each other. It feels amazing. I don't know know what that means.
Most of the time I feel pretty in control of the whole thing, and content. Sometimes, though, I feel like I want to burst.
like an oyster with a pebble inside, only I don't know if I'm making a smooth beautiful pearl from constraining my love for Annie, or if it's just a jagged stone tearing me up inside.
I'm sorry if I'm just rambling, I just need to get some of this out today.
Better than telling Annie I'm in love with her, or sending vaguely flirty emojis all day....