So if the significant other in a relationship had a thing with a friend 3-4 years ago, why can't the guy be trusted?

Someone please help me answer why a can't a girl trust a guy from that when. The. Guy doesn't flirt or nothing but hangs out with the friend and he loves his girlfriend
So if the significant other in a relationship had a thing with a friend 3-4 years ago, why can't the guy be trusted?
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