Would you be suspicious if a coworker and a boss had taken vacation days at the same exact time three different times?

Could be a coincidence. In any case, away from the jobsite it is no one's business.
Typically, yes, but two years ago we had a manager fired for having a relationship with an employee. So my job does care what happens outside of work when it comes to people under managers.
Doesn’t matter.
its none of anyones business
It’s nature for people to talk and judge, like it or not. You give people something to talk about they’re gonna talk. If you don’t want coworkers gossiping about a possible relationship, don’t date your boss or don’t make it obvious. Didn’t ask if it was our business, asked for an opinion. If you don’t wanna answer the question go elsewhere genius
Karma…it visits everyone,
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It sounds suspicious for sure. However I don’t think it’s your place to bring light to it at work,
If it happened 3 times like you describe, yes I'd be suspicious. Especially if there is other corroborating evidence.
Yes I'd be suspicious. It seems to often to be a mere coincidence.
Suspicious? Why would I care. What they do is their business. What I do is mine.
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