How can I tell if this guy likes me?

We were at a kickback the other night, and were both kinda drunk and he was really flirty, like putting his head on my shoulder, and running into me and dancing with me and making faces at me, and it was going well. But yesterday, he was more reserved. We talked but there was no flirtation. Alcohol makes people horny but drunk actions are sober thoughts so I can't tell.