The usual stupid situation of does she like me??

Basically there's this girl i've been quite good friends with for a few months but recently I've started developing feelings for her. We text more now, talk everyday either face to face msn facebook etc. she comes over often to watch tv and stuff and were a bit more flirty now.

All these things point me towards her liking me but then something happens like the other night where she asks me to go somewhere with her and one of her friends was there as well who she see's a lot (who likes her but she rejected him as she wanted to stay friends) and she spent the majority of the night talking to him and joking around which just made me thought maybe she doesn't like me.

I guess what I'm asking is do you guys think she likes me or see's me as a friend? and do you think I've thought too much into this other friend thing the other night?