I think I'm bisexual or am I gay.

okay so im 17 and at college and I met a girl about a year ago (who happens to be gay) and we got on really well blah blah folk said we were like an old married couple, we flirted alot and I dunno I just felt this connection to her. We were also texting and she said she was watching a movie 'imagine me and you' and I was like oh I really like that movie (it so happens to be about lesbians) anywho she said she liked this other movie better I said it was shit (also lesbian movie) she rattled off a few more then finally said no straight girl has seen this many lesbian movies I wished I told her at the point that I liked her but hey ho I never and said well this one has or something stupid like that and she was like mhm. We walked past some lgbt posters in the hall and I was like hm whats that she told me and then said I think their should be a Q though for all the questioning girls out their and looked at me :L I text her by a mistake one day (ment for someone else) so I was like oh shit sorry and she replied you must of been thinking about me.
Anyway im babbling on, the point is I think I fell for this girl and I did nothing about it and she moved half way round the world to travel for a year or 2 (yes I fucked up) but now I realise I enjoy flirting with girls and guys for that matter but I dont have a a strong connection with guys yno a spark. but I sleep with them anyway. for instance this guy asked me to be his girlfriend and yes hes a nice guy but I found the word no coming out my mouth automatically and I ended up sleeping with him, which I think I did out of pity ( not a good idea I know) I dont know if im just sleeping with these guys to hide the true fact that im gay or am I bisexual?
please help!

i say gay if you r just hookin up wit dudes then not for u but u have a spark with this girl this is just like what u r ment to be if u dont mind bein with her be with her or a girl ok go with a girl then go with a boy c what u like most.

U sound extremly confused, but ima say ur sleeping with guys cuz u don't know what to do with urself, sounds like u like girls more than boys...u sound like a straight guy following the gay trend