Friendly Touching or Flirty Touching?

So I met a guy about a month ago who was placed in my small group in a class. We have a lot in common and laugh and joke a lot and he doesn't really talk to any of the other girls in the group but he's not shy or awkward at all and has also become buddies with the other guys in the group. Recently he's started coming up to me and bumping my shoulder giving me hugs upon arrival and departure and he always puts his hand on my middle back. We also started going together to a class related supplemental lecture that's not required. I'm trying not to read too much into this but is he being flirty or just friendly?
Friendly Touching or Flirty Touching?
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