What does it mean if a guy holds you by the waist?

Anonymous
So the other night at the club I was working at, a friend was there with his group of friends. Naturally I went over to say hi and ended up hanging out with them because we all knew each other. Throughout the night, my friend had his arm around my waist almost the entire time. Be it that he was trying to protect me from the crowd or when we were walking. Thing is, I don't know him well but this seems to be the second time this has happened. I've never rejected him and his actions. In fact I actually enjoy his company. We spoke the day after really casually too.

I want to know if he has any interest in me or it was just because we were at a club.
What does it mean if a guy holds you by the waist?
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