What does it mean when a guy touches your waist? Why do guys like to? WHY?

Anonymous
We were talking and I swayed for a moment out of tiredness. But then he put his hand lightly on my waist, but only after I had steadied myself. It lasted maybe 4 seconds. He smiles quite a lot and tries to sit/stand next to me when he can. Does this mean anything or am I over thinking all of this? This is not the first time its happened. So what do you think?
What does it mean when a guy touches your waist? Why do guys like to? WHY?
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