Confused? What to think?

I have really liked one of my guy friends for a long time, probably about 2 years. I finally got enough courage to tell him how I felt, and when I did, I just said that I really liked him, and had for a while, and hoped this wouldn't make this awkward between us. I caught him by surprise, and he just mumbled an "Ok". I left mortified, but he never did say anything more to me, so I am still unsure how he feels. However, we are still really good friends, and there isn't awkardness between us.

BUT

I've noticed a few interesting things. The reason why I finally told him, was because I thought maybe he liked me( always concerned about me, asked me to prom and when something came up and he couldn't go to prom, he took me to dinner and made me brownies.) This was all before I told him. The first few weeks after I told him, it was a bit awkward, we were more reserved, but now it's fine. But he still does things for me or towards me that he doesn't with our other female friends. Just always more kind to, he always makes eye contact even though he doesn't with anyone else, always looks towards me etc. I've noticed he also mirrors my movements a lot. If I sit one way, he'll mimick me. If I move, so does he. I simply thought nothing of it until today. Today I was talking to him after class, when a freshman knocked into me(i'm a senior) . It was odd because there was plenty of space around us, but when the freshman did, he just completely glared at him.