You hurt her....its going to take time to get over that.
She probably still really likes you but is scared of putting her trust in you again, nobody wants to put themselves in a situation where they will probably get hurt again. Its like shoving your hand in a fire and thinking hmmm should I do that again?!
She'll come around (unless she's a wierd and twisted girl who just like attention), I know it doesnt seem it at the moment, but she wouldn't be hanging about with you if she didn't think there was a chance of making things better again.
Good luck and don't give up xxx