<human>: Give me the gist of the text in a nutshell

Just for the record, I am a male. I have a shitty situation where I am REALLY close friends with a girl, we get a long great and spend lots of time together. I started talking to her because she was a pretty girl who seemed sweet, what guy wouldn't?

However, she has a boyfriend and I don't want to get in the middle of that. I thought I'd let my feelings fizzle out and eventually it would become plutonic. I do feel she likes me, considering she spends more time with me to sleeping in my bed(she was drunk so I did not do anything, because well I think that's wrong) I think she has been flirting with me and/or my have feelings because whenever I tell her I have a date i feel she gets a little jealous and also she ABSOLUTELY refuses to let me meet any of her girlfriends.

That's not even the worst part, since spending so much time with her I think I may be falling in love with her. I think it's unhealthy for me, I went through something similar in high school and I was a wreck. I don't want to go through the same thing in college. It's really upsetting because she is probably one of my closest friends but I think we have something that will never happen as long she she is with her boyfriend. I feel me being so close with her I may refuse to date because of the possibility of ending up with her, which is unfair to me. 

At this point I don't know how I can continue my friendship with her. 

How can I continue being friends with her? Also, would you suggest me trying to "break-up" the friendship?
Thanks everybody.
<bot>: how can I maintain my friendship with a close friend of I think I may be falling for her. If not, how do I end the friendship?