Thanks for the replies. I've only known him for about a month, but we've become very good friends in that time. And no, he wasn't drunk
I saw him again after I wrote the first post, and I tried to get back at him by pushing him into the snow too. (We're both 20, by the way, and not usually this immature.) I was climbing all over him trying to tackle him down. He definitely didn't try to stop me, and even egged it on saying "Come on, that's the best you can do?" I guess that's a good sign? He is not usually the flirtatious type, if anything a bit on the shy side. However, we are quite close and maybe he just feels very comfortable with me now. I will see how things go.
Thanks again for the help.