I've known this girl since 6th grade. We have often flirted (so I think). I hadn't seen her in about 3 years since we have been away at college. We have not really been in touch. She frequently asks my other friends about me and has even expressed among them that she "liked" me.

However, we hung out together for the first time about a week or so ago. She seemed very enthusiastic to see me. We hung out a couple times and I felt as though we had a connection. We went out drinking one night so things may have fueled our instincts for what happened next. My sister came and picked us up. I came inside apartment and she asked me that I could stay the night. I told her that I didn't want her to do anything that she would regret. (She has a boyfriend, but I don't think he treats her very well.) She responded "what would I regret?". I picked her head up and kissed her. Then she said "maybe you should go." I told her Ok and Goodnight and then I left.

I still feel like she let me kiss her even though she sent me away. Anyway, we still spent the next couple of days together and she even asked me to breakfast the next day via text which I slept though. We never mentioned the kiss to one another. There was tension in the air, and it seemed as though she had a hard time looking me in the eyes after that. She is very hard to read seeing as how she is so flirtatious. Plus I was afraid that bringing up the topic would change our friendship, because more than anything that comes first in a relationship. It is just so hard to watch someone you care about grow without you.

She left town today and I'm leaving soon so we are going in different directions. It hardly seems practical to invest so much emotional energy into such a situation but I really can't help myself. I like her and really always have. I think it seems desperate to confide in her that I feel the way I do. I even feel the same way airing out my emotions via the internet. I really would like an opinion on the situation because I really don't want to nor can I afford to feel the sadness I feel since she has left. I don't love her but that doesn't mean I couldn't. I really don't feel as though I know her seeing as how we have spent so much time apart. I really just want to tell her I miss her, but I don't want to smother her and I don't want that stupid boyfriend speech where I end up sounding like the creep for liking a girl with a boyfriend. I just think she deserves whatever she wants. I just want her to want me.

How do I go about this? Does she like me? Have I been mislead? Will I confuse her? Is it worth it? Am I under the influence of assumption? These are all things I would like to know and I've been racking my brain about the possibilities. I would like some help. Please let me know what you think.

She may like you but also still likes her current boyfriend. Maybe she wanted to test the water with you and see if she felt anything could come of it.
I'd say don't pursue it... let her contact you and, if she does, you can tell her then that you have been thinking about her. The ball will be in her court to let you know if there is any interest or not.
She is going to have to decide whether she is staying with the current boyfriend anyway as you wouldn't want to get messed up in a triangle. Don't get involved unless you know she is really free to do so.

You asked for advice and part of it is the boyfriend speech. She has one. Leave her alone.
The kiss could have been alcohol or curiosity, but she is still unavailable
When and if she is free and she wants to pursue something with you, she will find a way to contact you. In the meantime don't get into something you know you shouldn't.

She very well may like you.. but right now her attention is set on her boyfriend and when that happens there is little room for anything else... she is distracted and therefore is not going to act on any possible feelings for you... but if she isn't being treated well as you suspect.. then this "kiss" that you shared with her is probably making her think... and when things go badly with this guy if that's what happens I'm willing to bet she will come around.. for now just live your life.. dont put it on hold waiting for this girl because you may be waiting for something that may never happen

OK because I'm a girl, I can see that she likes you. But she also wants to take it slowly. I think she regretted the kiss that you gave her and that's why she changed her mind. If you really love her, just keep in touch with her in some way. Don't forget her. Try talking to her about her boyfriend without being jealous (she will like that because I do) take it easy on her and make her laugh. Try being a best friend not a boy friend at first. Then you'll feel that she feels different about you.
Hope that helped...
Good luck!

If she is having problems with her boy friend they are problems for she and he to settle. Bringing you in on it is wrong and it puts you in the middle. It's none of your business anyway.
You already have feelings for her and your getting caught up in their problems puts you in deeper.
Leave her alone. If she wants to be with you rather than him, she will leave him and hopefully take some time to herself first before going to you.
You don't want to be a rebound either.

(She has a boyfriend, but I don't think he treats her very well.)
Doesn't matter not one bit, as its not your business. What is your business is how you treat your friend with respect, and not cross the boundaries of good behavior. You want to keep her as a friend, keep your feelings to yourself and forget the romantic notions stirring in your head.

I don't love her but that doesn't mean I couldn'tYou had fun at your reunion, so respect her relationship, and keep your dignity, and distance. Why cause a problem where there is none yet.

Booze, and a kiss with a nice female, has you wacky my friend, and she wasn't going to sleep with you any way, just talk, but your kissing her told her its time for you to go. Don't let your inexperience or ignorance in the ways of woman have you doing something stupid to mess up the friendship, or foolishly make things awkward, by confessing feelings you admit you don't have. Let it go and enjoy your memories.

No need to be stuck on them.