So, I dated this girl from August to December of last year. She officially broke up with me in december, but she wouldn't leave me alone after that (wasn't sure of her decision, wanted to stay friends, etc), so we sort of stayed together even after that point, in a more open relationship. Three months of a lot of stress for both of us went by, and she finally re-officially ended it last night. Recently I met this other girl who coincidentally lives on the same floor of the same dorm building as my ex, and my ex is freaking out at the thought of me doing anything with a girl who lives on the same floor as her. She said she would literally go crazy, and probably have to move out of that dorm. This new girl is not someone I'd want a super-serious relationship with probably, but she's someone with which I could see a fun friendship/casual relationship/friends with benefits happening. Do I respect my ex? Or do I just take what are logically my rights and not care about how she feels?