<human>: I've been "with" Sarah for about 3 months now and I've really hated our relationship. I'm 28/she's 18. I cheated with her on my girlfriend of 3 years and was subsequently dumped by said girlfriend. Didn't know what to do so I kept things up with Sarah and she moved in with me pretty quickly, like a week after the break-up. Its not fun anymore and its just stressful and she is always paranoid or hurt about something. We don't have a helluva lot in common either. I really regret our relationship and I regret cheating with her and I want it to end but I don't know how to. 

She acts like she is way in love with me (even though it hasn't been that long) and she basically lives in my house with me. We met because I offered to smoke her out and that sort of became a thing, and stupid horny guy that I am/was I took it further. It wasn't supposed to be anything serious. I was fucking around with her for two weeks and my girlfriend found out and refused to stay with me and dumped me (and I was going to propose this Christmas so that is gone too). I stuck with Sarah and aside from the sex nothing is good. I don't relate to her. I don't really like her personality. I just want to be done with this chapter. 

I tried to break up with her last week and she refused to leave and we somehow made up. I don't know how to cut the cord, clean. Need some advice on that.

Give me the gist of the text in a nutshell
<bot>: In a relationship with a girl I don't love (or like) but she won't let me break up with her. Help me.