Lifting his shirt while he's talking to me?

i was talking to this guy I know today and as we were talking he kind of lifted up his shirt, I don't know what he was doing but it was kind of like he was fiddling with it, wiping off his hands I don't know, but obviously he knew that he was exposing like half of his body to me as we were talking, I seriously had to try so hard not to look because there's a guy kind of shirtless in front of me! this isn't the first time he's done this around me but I want to know why he's doing it.
Lifting his shirt while he's talking to me?
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