she is young and sounds like she isn't so great at communicating her feelings but rather tends to act them out. it's okay for you to decide how long you want to wait around for her and if you really want her back. she is not treating you well at all. it sounds a little like she may cling onto whomever is the nearest guy and right now that is the guy from out of town. i would focus on taking care of yourself and get out there and have fun with your friends. you may need to be a bit more assertive with women. i.e. don't put up with cr*p. also, rushing things in a relationship, like living together, isn't a good idea.