Anyone, please help, teenage love problems?

Around 8 months ago now, i was at a cricket match and got talking to this girl who i had been talking to a lot and had a little thing for. As the day went on we got closer and closer, I had been hesitating wether to try to just give her a little signal of intent, although i later found out she knew i liked her. Around a week later we had a late nite chat on msn and i found out that she liked me, also the fact that i made a lad jealous by sittin there with her hahahahaha, but by this time she was getting with another boy. Now we are both single and seeing eachother again on a regular basis, and find myself wanting her again. With her past feelings for me, no matter what they are at the minute, what should i do to try to get her back interested in me again?