Guys, what does this mean?

My guy friend (who I have a bit of a crush on) is always touching me in some way. Most of the time it's just a hand on the back or the waist, but he's also touched my ass and my breasts a couple of times (not like I mind).

You would think he has a thing for me, but he's naturally flirty with most girls, so I really don't know what to think.

What could it mean?

Guys, what does this mean?
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