Confess To Your Crush

Up until now in my life I have had three girls like me (Not at the same time obviously lol). I didn't mind that they liked me and it never affected our relationship. Two of them were my really good friends, so I didn't want to change anything in our relationship also I didn't really see them like that. The last was a friend I met class and we hung out from time to time (strictly at school though) and I noticed the change in her behavior towards me one day. She started hanging around me more and when she did she was constantly touching me or putting her arm around me. She would avoid touching others though. (Not that touching is an indicator of having someone like you.)
Soon after that she told me she was pansexual, so I asked her if she was interested in me. She said she was and asked how I knew. To be honest I have always been pretty good and determining whether a person likes me or not. Anyways I told her that I was cool with it.
I was always cool with it and the fact that I never thought "Oh I can't date you because I don't like girls" never popped up in my head it was just because I didn't really see them that way. Knowing that girls liked me brought up some questions though. Was I bi? Gay? I decided to try to pursue a relationship with her by making a deal that when we reached a higher grade and started out with a new year I would try dating her (Was that a jerk move?).
We ended up going on a trip together along with some other school mates and I realized I didn't really like her that way. After the trip I told her I couldn't go through with our deal especially knowing that I couldn't see her in that way. Another factor that I didn't think of was that I never asked her why she liked me.
I didn't really talk with her all that much I only shared certain interests and would from time to time ask her to recommend some things. I still had those questions though? By not rejecting her just because she was a girl but for the fact that I wasn't interested in her, was I still straight or was I really bi? I would really like some help in figuring out whether I am or not. How did you guys know?