Any ideas to help my relationship?

I've been dating my man for almost 2 years now; we've been living with each other for a year. A few months back, I had to break my lease because I was going to move across state for school (we were gonna do long-term). My bf moved into an apartment with someone, I moved in after I had to put my plans on hold. Recently, my bf has had one of his friends because she got kicked out. At first I was cool with everything, but now I've seen her for the manipulating, cunning person she is. On top of her manipulations, she has disrespected my things by borrowing my clothes (even my deodorant w/o permission ew), stinking them up with cigs and perfume and crumpling them up on the floor. I'm highly allergic to perfume and told her repeatedly yet she keeps wearing. I've been pressing him and the other roomie on the lease (cuz us girls aren't) to get her to move out. Other roomie is being neutral, but I feel like my bf has had his balls chopped and won't give it to her straight. He's told me that he's talked to her, but she "can't afford to move out for another month". She told me a week after moving out, that if this didn't work she had another place to move into. And she convinitaly didn't show up the day that she was supposed to give pay me back about $50, now claiming when I txted her, where's my money she said that she told me that she can't pay for another 2 weeks. NEVER happened. I am stressed and depressed with this and so many other things lately, idk what to do.