<human>: I met this girl through a friend of a friend and the second night we went out together we had sex.  The first night she didn't mention that she had any expectations of me and since it was a drunken hookup I figured that it would stay that way.  Since we're both abroad, I've been travelling to different destinations every few weekends with only my group of friends.  After I got back from one trip we hooked up again, and after I got back to my place she started texting me saying that if I was just in it for the sex I should quit.  At that point, I thought I liked her enough so I convinced myself that it wasn't (in hindsight that was a really douchey move on my end.)  Then I found out that the two of us were really different people.  I liked to go out while she liked to stay in, she wanted me in constant contact whereas I'm not that clingy etc.  She meets me at a bar for a third time and in my drunken stupor pulls me back to her place.  Against my better judgement, we hooked up again.  I saw her once more before I left for another trip (nothing happened) and during that trip I resolved that I would have to end it.  She seemed a lot more invested than me and I was convinced that I would be leading her on if I continued it.  She invites me to a party where I basically end it.  I pretty much say that this isn't working for me, and that I don't feel right continuing it.  At this point she tries to throw herself at me, saying we can have sex no strings attached but I say no.  That was about 2 weeks ago.  She texts me from time to time telling me about pointless stuff and then today she texted me something along the lines of: did I just mean nothing?  

What should I do?

Can you summarize the given text in a few sentences?
<bot>: wasn't in a relationship with this girl but she seems extremely hurt after I ended a 4-week fling which I didn't think would work.