You might check out the "I don't like my metamour"
thread as a start.
I feel your pain. I have had the issue of "If him, why me?" with one of her bfs that I dislike. But I don't deal with him and I've come to terms with the fact that she does like him.
Me: 55 straight male in a W
- Primary: C - poly female - together since 2009
-- Her BF A: poly male
- My GF: K - poly female, sub