Should I be suspicious of my girlfriend for linking arms with another guy?

The guy is her co-worker and they usually hang out with their group of coworker friends. I was told by someone from their group that during one of their recent hangouts, they separated from the group arms linked while walking down the street briefly.

I always thought that gesture is something you only do with your significant other and hearing it pissed me off.

Not gonna lie, but he's a good looking dude and people seem to like him.

He's also jacked and I'm pretty sure I cannot kick his ass. Do you think something is going on? What should I do?
Should I be suspicious of my girlfriend for linking arms with another guy?
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