Ok not sure if this is the right place but some advice would be great.
I started a new term at university my 3rd and final year, moved in with new house mates I've never met so made some great friends already I've been here around 2 months now and we all get on great. I get on really well with one girl and we have playful banter as you do as friends, house mates have told us to get a room on many occasions as we play fight haha. When we watch TV she sometime slightly cuddles up to me for a while which is nice, she is really flirty with me and I know that she is a flirty person but I've not seen her really flirty with another girl yet only guys. She is straight but has said if she fell in love with a girl then she falls in love with a girl. One drunken night I ended up texting her saying I would give her a better night than the guy she went home with... nothing was said. Then the next day they all took the mick which was fine we all laughed it off. So she kind of got the hint I kind of liked her, since then she has been flirty still with me, and to be honest its getting annoying as I feel like I'm not sure if she is just flirting for the attention or not. I'm not sure if I explained this very well I hope you can grasp some of this. I would ask her straight out but I don't want to make things awkward as we all live in the same house

You should have thought about the fact the you live in the same house before you made the comment. If she has not said anything to you it probably means nothing. If it is annoying either ignore her or ask her what's up. She is probably just being her flirty self.