What the heck is up?

So oon the last day of school I found  out that someone had told my crush that I liked him I was so mad. I also thought this is something my step sister  would do but no she didn't... great I really thought it was her and I asked everyone I told and they didn't either and then I found out that more people knew when I can back to school yesterday. He's also in my drama class and today he sat next to me it was really akward I don't know why he sat there. But we didn't talk. I don't know what to do... HELP!