<human>: Condense the text into a few key points

I was seeing a girl at my school for a month or so back in November/December... we were never technically dating, but we were doing things of a sexual nature and I think we were attached emotionally. After we ended things, we kind of stayed friends. Things were awkward for a bit, but within a month or so we were back to hanging out and talking a lot again. Within this time, both of us hooked up with other people, but I couldn't enjoy my hookups because I still had really strong feelings for this girl (lets call her Meghan). 

Anyways, for the past two months she has been hooking up with another guy. The kind of the guy that makes me feel really inadequate as well. He's taller, in better shape, good at sports, smart, he even won awards for his performance in a play that all three of us were in. However, she just tells me she's in it because he's good looking, and that they hardly talk. While all this is going on, especially in the past week or so, she has been really attached to me. Telling me that she's steps away from falling in love with me, that she can't live without me and is terrified of when I leave this summer. 

The worst part is that I still have feelings for her as well, but it is brutal knowing that she's off with this other guy but saying all these things to me. Should I just leave? What is going on through her head? Or should I say nothing and just wait it out? Once the 23rd rolls around, I'm going to be going off on summer, and then a new university and a different city... This probably could do with more specifics, but it's hard to sum up several months of weird relationships.
<bot>: pretty much the same as the title + I'm leaving in eleven days and not sure how to deal with the situation.