You know, i was in a polyamorous relationship for about 8 months. I was with a man who was married and we were all living together, happily for about 3 months before the wife decided she didn't want to be part of it anymore. She also decided to become a man (that's a whole other story)...anyways, we had a lot of fun and it was really nice to have two different people to love. Everyone is different and you love different people for different reasons.
I ended up with the husband (they divorced),but I still miss the wife because I really loved her...In a friendly way. She was fun to hang out with and liked to expose me to different things like art and music.
Anyways, I just wanted you to know that I kinda understand what you are going thru. Maybe not entirely, but kinda.
BJ