My guy friend whom I have known for years has been acting strange lately.
When we hang out (as a group), he always touches me with different excuses for example patting my hair, shoulders, arms, or touches my waist, lower back and even put his hand on my thigh for a few secs when I sit next to him or rest his head on my shoulder while no one looking.

At the time I dont think much cos we are like bros so I dont mind physical contacts with him (not with other guys though). But he doesnt do that to other friend girls so I find it strange. He has a girlfriend though, they have been together for 2-3 years. So I always try to draw a line. But I have to admit I find myself thinking about him and me.

We always act mean to each other but once when I go on a trip and when we first saw each other after a few weeks, he hugged me and said he missed me. Seriously, what is his deal? T-T or am i thinking too much?