I made a HUGE mistake.....?

i made a HUGE mistake , you see this boy asked me out and i thought he was kidding and so i said no and i didnt even really like him then but now i like him and i think he was actually serious i should have said yes buT he doesnt like me anymore! should i move on? or should i try to do something about it? if PATRICK DUNN is out there somewhere on Yahoo Answers PLEASE ANSWER THIS BC THIS IS ABOUT YOU!!!!!!!!!!!!!!!!