I kind of just need opinions more than advice.. but here goes my story...

I'm an 18 year old girl and I met another 18 year old girl through a friend. We went clubbing together mostly and drunkingly we ended up kissing once. It was sort of a fantasy come true for me because for a while I had this desire to kiss her. I've always been bi curious and she once said something to me that led me to believe so was she, so knowing that there was kind of a "chance" I started getting infatuated by her.
The more I got to know her, the more I couldn't help but have feelings for her, but even after we kissed it was bussiness as normal. Months past since then, and we're not really phone friends (occassionally or for planning stuff), but together with our 3rd friend we hung out sometimes (often at clubs and she wasn't up for more kissing really) and we just have great chemistry.
Even though I was always hoping to kiss again, my feelings for her that I had after that first kiss subsided and went away.

A few weeks ago, we ended up being alone and drunk at a club again, but this time we kissed loads of times.

At the beginning of the night she coyly said "who knows maybe we'll end up kissing again.." and I didn't reply. Straight away we were dancing close and stuff and eventually ended up kissing again and again and again. We were both drunk but it just felt like it was more than that. Like there were feelings involved. At one point she made up a stupid excuse for us to kiss again, and at another point she asked me if I don't care that everyone can see us (I would've cared but I wanted to kiss her again for so long and no one I knew was there, so no I didn't..) . We hugged a lot and she said that she'll love me forever and other stuff like that she REALLY missed me (i think she repeatedly said that but I can't remember), but it was kind of a drunk statement. Everytime I see her, she tells me that she misses me a lot, but she's the kind of person who says stuff like that.
She's got a boyfriend she's living with, and she's always saying how she wants us to be in touch regardless of our 3rd friend, but when it comes down to it she doesn't make that effort or call for no reason, but she could just be afraid, then again she could just not feel the same way.
Basically, after that kissing episode I can't get her out of my mind. It just felt so real.
I'm generally straight (lol), but stuff happens. We just have really great chemistry and there's something there. Anyhow, we only spoke the day after the kissing happened, and haven't since then, and it's been a couple of weeks. I really miss her. I'm not expecting to be in this serious relationship with her, but I can't deny that I have feelings for her, and I think she does too, but I can't be sure and it's driving me up the wall.

I've spared details, as to not bore you even more, but anyone got any input?