My boyfriend hung out with his female coworker one on one. Is this normal?

It’s not like they are close friends or something. Just coworkers and it started out in a group but then at the end everyone left and it was just the 2 of them. Nothing happened but just find it off that he was hanging out with his coworker just the 2 of them

Yes it’s 100% normal
It’s a little suspicious since they aren’t close friends
No it’s very suspicious
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My boyfriend hung out with his female coworker one on one. Is this normal?
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