Am i over-assuming?

I was reading a senior's study guide and I quizzed him. Strong eye contact because it is normal for me to make A lot of eye contact if I am talking with someone. I say painfully honest things, such as "Ah, yes, you are right, what a surprise, you've exceeded my expectations." That, I really did say.

After that, he started initiating conversations but it never lasts long, maybe that's because of me. Sometimes calling out my name and just waving for no reason. Unusual eye catching from afar with me. There was a time he touched my shoulders with both hands but I quickly grabbed it off and said "Don't touch me." Out of reflex. He still touched me after that one more time, which I just edged away and he once more remarked about how cold I am. He does this "I'm watching you" hand motion with me while passing by outside my class. Winked at me, of which I winked back because I do still have a sense of humour, we laughed. He now winks at me when he walks pass. I was going out the door and he blocked it with both arms as if he wanted contact with me.

Still, I am monotone most of the time because I do not react that much. I still do smile and laugh. I'm concluding he either likes watching me "react" if I ever do because I do not react like the common person even if I do react. What do you think he wants with me? He is friendly with everyone, but why does he continue to socialize with someone he calls "really cold."? Also, he seems to have a lot of female company but not a girlfriend even though they sometimes sit on his lap. Am I just impossibly unreasonable and overreacting because I know I don't have much of a clue?

If he is interested, how should I lead him on without becoming totally open (letting him know I like him to a far extent) or out of my character (monotone with a sense of humour) or part of this "female company"?

Please do comment.