He just stopped talking to me...why is that?

I have a little crush on one of my guy friends, he's always making me laugh, we play around a lot, he's rude to me at times, he's always finding an excuse to talk to me. On Wednesday, we were all over eachother more than usual, like we were tickling eachother, he touched me on my thigh like 2 times while we were playing around...even our teacher said that he has a crush on me. So since the grade 10 literacy test was on Thursday, we didn't go to school(because we ped it). On friday; he came to cl late and i went over to him to say hi but he didn't really answer so in business cl, he still wasn't talking to me...he was talking to this other girl and they were talking and laughing for the whole period...so i was jealous and i got up and went over to talk to this other guy and we were watching some videos on my ipod. I saw my guy friend give me this look from the corner of my eye, like it wasn't a bad look....i can't describe it. What could be the reason? srry that's it's long