Very confussed over this guy?

So I had a one night stand and he was amazing.He text me a week later to come over to do it and I did it was amazing again!So now he stopped texting me and when i saw him at the club he didnt say hi and left with some girl.Im not ugly, 5'1 weight 117 36c. i mean if not why did he go down on me for 2 hours. and me trying to act like i didnt care i danced with other guys.the thing is that i hadnt slept with no one esle since my 3 yr relationship 8 months ago.He brought me back to life.You think i have a chance he'll keep looking for me n want me?How should i act to make him want me again?