Guy friend put his head on my shoulder. Does it mean anything?

Anonymous
Long story short, I've known this guy for a couple of months and I'm not that close with him. He's just tagged along at some of the events and I met him through a mutual friend. Anyway, it was my birthday celebration last week and a group of friends (we were maybe 15 people) and I went to a bar, including the guy.

The guy spent a lot of money on buying food for everyone and bought me shots several times.

A couple of hours later, we decided (a group of five people or so and him included) to go to have some late night food. My girl friend went to the toilet suddenly and the minute she left, the guy put his head on my shoulder, resting it there for a long time. When the girl came back, he lifted his head again as if nothing happened.

Does it mean anything that he put his head on my shoulder? And why did he do it when the only girl in the group left?
Guy friend put his head on my shoulder. Does it mean anything?
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