A guy put his hand on my waist when we took a picture. What does it mean?

Anonymous
Alright so I saw this small indie band in concert and after the show me and my friend took a picture together with one of the members. After, we chatted with him for a few minutes and he was super sweet. Later on as we were leaving the venue, I noticed him helping put away his band's gear. I turned and we both waved bye to each other and I told him to have a nice day. Later when I looked at the picture we took with him, I noticed his hand was on my waist but his other hand was just on my friend's shoulder. I know that this may not mean anything but I was curious as to what other people think. Could he have been a bit interested in me? Call me crazy, but I did look at many other pictures he has taken with female fans and his hand is always on their shoulder. Oh by the way I'm 17 and he's 20.
A guy put his hand on my waist when we took a picture. What does it mean?
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