<human>: Can you succinctly summarize the text in 1-3 sentences?

So here's some back story. Around 7 months ago my girlfriend and I moved up to the Boston area to finish college/grad school. We had been together for 5 years when we moved up. We had our rough patches but all in all we were in a loving committed relationship. Our first roommate moved out and we asked one of her guy friends. We started fighting more and more and eventually we decided it was better to just end things and amicably live out the rest of our lease. Turns out that now she is going out with him since I moved out. I'd have no problem with it but at the same time they are forcing me to pay 450 dollars while they have sex in the apartment and not allowing me to stay there. I am now paying over 800 dollars a month for two places. Reddit, my question to you; is there anyway I can get out of my lease or anything like that that would allow me to leave?
<bot>: Girlfriend left me after 5.5 years to go out with roommate and I am now being forced to pay rent to make it easier on their sex lives.