Does he like me or is he playing me?

At my brothers party I first met this guy, he has a kid, hes only like 17. But that dont matter. He kept on looking at me when we were watchin a movie and while he was playin a game wit his friends. he also pulled me toward him when someone dropped a drink right by me.( so I dont have to get that drink on me) Well he just all the sudden hugged me like really really close. We were touchin each other. But while I walked outside he kept on looking at me, he told some of his friends to go wit him somewhere else, but while he was walkin away he was looking at me. His friends which are mine too told me that (the guy I like) liked me back. And he thought I was beautiful. He told me I was cute and beautiful. I only met him but its like I like him! Weird! Cause the next morning I woke up with butterflies in my stomach, I felt like puking, I thought bout him constantly.

But a few days later he was trying to get with my sisters friend, he only met her for the first time too which makes me sad =*( I cant seem to get over him What should I do??? The longest advice would actually help the best Lol ;)