How do I deal with my coworker crush who asked if I’m jealous and then recently I saw his girlfriend in the flesh?

A guy at work once asked me twice in a row “are you jealous” when he told me he was texting his girlfriend at lunchtime. I didn’t answer.

Then recently his girlfriend visited him at work and I am a cashier and had to check them out.

What did he think?

How do I deal with my coworker crush who asked if I’m jealous and then recently I saw his girlfriend in the flesh?
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