Why would people assume that an introverted female coworker had an affair with another coworker?

if there were no clear signs of flirting, attraction, secrecy or anything else. I keep to myself all the time, only talk about work etc. So why would people assume that there was something going on between us? We’re not even very friendly with each other

Why would people assume that an introverted female coworker had an affair with another coworker?
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