Is this possible?

It feels kind of weird to talk about it when i haven´t even told anyone about this. Well, i´m going to say it anyway. I met this girl like a year ago. She was a friend of my (now ex) boyfriend.
She was super funny and everything but we were never really close.
But months have passed and I broke up with my boyfriend but I kept going out with his friends (they were my friends, too!) and I started to speak more with this girl and we are kind of best friends now.
But there is a problem, of course xD. Several friends told me she has feelings for me. And i really didn´t know how to react because, when we hang out, she never tells a thing about it and hides it. She conffesed me she was bi but never that she finds me attractive or not.
I´m writting this because I feel confused as fuck! I´ve never been with a girl nor I found them attractive. But, the last time we went to a club together with some friends, while I was making out with some dude she kept staring at me the whole time and it felt kind of akward but i tried to ignore it. Then, she got furious with me because she tought he did a hickey to me (not true, though).
Then, she proceded to try to kiss almost any human being in that fucking nightclub!(she´s not a whore, that´s why it kindda supriced me, but i let her do what she wanted)
But, deep in my heart, i have to recognize that i fell jealous, betrayed, or whatever you want to call it. I surely not find her attractive but i want her to want me! This can´t be normal at all.
Am i really a bitch, aren´t I? (I know some of you will think that way, that´s why i didn´t even tell my friends about this situation!)

(PD: This is my first post and English is not my mother language, so i´m sorry if you didn´t understand something! :) )