That's almost the situation I'm in now. I live with my boyfriend and we have raised our dog from when she was a pup. She is so precious to us. But the relationship is not going anywhere and although I was planning to move out on my own, today I was confronted with the idea of moving on without taking her with me.
I know I will resent my parents for it if I give her to him to keep, especially since I can't have kids of my own, unless I adopt. If I gave her up, probably the only time I would go up to see them is if my dad gets really ill. It would take me a long time to see them without getting angry.
I'm just going to wait until I have a stronger parasite killer (the regimine I'm on is not working effectively enough), then I'll make my decision.