Why would a guy your friends with react that way?

So I think the guy I work with might have a crush on me because a couple of guys were messing around with me we were laughing and the guy that I think that likes me was in the lunch room when I entered in to grab something he said "sounds like u guys were having fun out there". And the following next day me and the guy I think likes me were on the elevator with one of the guys named Dalton was flexing his muscles telling me to look and feel it. And the guy I think likes me said he's like a kid.

Why would a guy your friends with react that way?
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