Wow, what a tough decision to be in! This wouldn't work for me either, so I can understand why you are upset. I think that I would tell your boyfriend you need Lexi to live with you fulltime, but he is welcome to take her on outings, and obviously you two must hang out alot if you're boyfriend/girlfriend so I'm sure he'd see her regularly anyways. OR, he could move in! Maybe that's what he wants, and that's why he keeps stealin' your Lexi LOL! It seems kind of weird that he gave you a gift, and then expects you to share.