Do you think its human nature to have a suspicious attitude and a slight lack of trust in a relationship since you can't always see what they up to?

A couple of years ago at work a dude there (married) and the security guard (she had a boyfriend) went to the roof of the building and went into one of the rooms on the roof and she gave him oral sex there.

She cheated on her boyfriend and he cheated on his wife while at work.

Back around 7 or 8 years ago, my supervisor (married) was often in a dark room (only the computer monitor light illuminated the room) with a married woman with the door always closed and be in there for literally 25 to 30 minutes and they didn't give a damn who saw them (I personally saw them 3 to 5 times going in there and coming out the room laughing. 😕

Do you think its human nature to have a suspicious attitude and a slight lack of trust in a relationship since you cant always see what they up to?
Do you think its human nature to have a suspicious attitude and a slight lack of trust in a relationship since you can't always see what they up to?
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