What should i do about this girl?

okay ive liked this girl for a good 2 years now, we used to talk a lot and she seemed to like me, she then got a boyfriend before i told her i liked her and ive only recently told her i liked her and she usually makes gestures that suggest she lieks me back like waving/smiling/bumping me in the corridor,even though she still going out with this other guy, should i still wait to things end with her boyfriend or should i just drop it and get on with my life