YGirl: I think compersion would be when you are happy whether or not he is having other relationships, as long as he is happy. Also it might depend on the type of relationships you have/share. Compersion would be when he is happy when you are happily with someone else and he is ok with it or vice versa. So the last part of your post would fit well with compersion.
Of course, please tell me if I'm getting this wrong. I am new to the concept.
Life is about the journey and not the destination,
so what better way to know life
than to wander all the roads and paths set before you.