Clearly we can rule out the " move in " as some sort of trigger point.
The narrative: I'm sure it did/ they did feed each other. Also would it be in his personality to take on the victim role ??
If anything, I would say he was more of a champion. Nothing seemed to bother him and he seemed happy to see me happy. He was the guy who made breakfast for all of us in the morning, helped me do all the set up for our parties, even reassured potential partners that he was glad to see me happy. Actually, I was surprised at how quickly he adapted to polyamory.
But now as I'm talking to people, he was deeply unhappy and confiding as much to a few others - all young, female fringe members of my group. That's what drew my former best friend to him. In fact, she was part of a small clique that came from the same high school and we'd had problems early on with a few of them - all high drama types.
When I asked him last night why he didn't just come to me... he said that he didn't feel like he had the right, given that we've always been poly and he couldn't reconcile why he was feeling badly since he is genuinely happy for me and really does like my boyfriend. He takes responsibility for his part, but says that in his lowest moments, which were usually at our parties, my friend gave him a lot of "you deserve better than that" or "I can't see how you can put up with her being affectionate with someone else" which aggravated his emotions. He enjoyed that attention to his feelings that I was oblivious to him needing at all.
With me, he was always happy and looking forward to the next event.
We clearly have a lot of work to do to help him understand his irreplaceable role in my life, to redefine our relationship to one another and with others and to keep the line of communication open.
He swears he does not want to be monogamous and I told him given his desires in the BDSM world I think he should be open to finding someone who shares those desires. I'm relieved because I don't think I could give up my boyfriend nor do I think that would be fair to him. I would be deeply unhappy in a monogamous relationship, which he acknowledges.
We talked about how unproductive it is to complain about your spouse to other people and the effects that can have not only for us but for the people around us.
I asked him to engage with a counselor and he's open to that. If he can't process his emotions or advocate for himself, this is going to happen again. I told him that if it does, and I'm aware and looking for it now, I will absolutely leave. There is no reason to cheat on me because I will consent to him exploring and being in relationships with others. I don't need to meet them, necessarily, but I do want to know the timeline as the relationship progresses and I want them to know that I... exist
I'm still very hurt and confused about what he's done, I don't understand why he didn't come to me first or come clean about things earlier, but I feel better about the prospect of my marriage recovering from this.