<human>: Can you provide a brief rundown of the text in within 3 sentences?

I'm not necessarily sure what I'm asking for help with, but the story goes something like this:
I [18/m] started talking to this girl [18/f] about six days ago. We had a few good conversations, and we went to an open mic night as sort of a date (she's an art major, so she likes that kind of stuff). We came back to my room and had sex sort of spur of the moment. We have had sex several more times over the past few days, and she thinks we have a relationship going. I'm not sure that I want a relationship, even though I may have said that I did when we first started talking. I have been in a semi-depressed place lately, my grandma died recently, and my cheating ex and I recently broke up. I was emotionally vulnerable, and I made a bad choice, sex when not necessarily interested in something long term, in order to make myself feel better. Now that it has happened, I really don't want to continue it, but I also don't want to be that guy. 
I guess I'm really just asking for some analysis, and asking for advice on what to do. But then again I might be looking at this wrong, so I welcome your thoughts and opinions. And of course, if you need more info, just ask. Thank you /r/relationship_advice!
<bot>: had sex with a girl looking for an ltr, don't want ltr myself. Now she wont leave. Don't know what to do.