How am I suppose to act around my crush at work after I just found out he slept with another?

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Didn’t mean to send that quite yet. He slept with another coworker and I don’t want him to know I know but a part of me feels like I’m going to be sour and quiet around him and if he tries to touch me I just wanna tell him don’t touch me …
How am I suppose to act around my crush at work after I just found out he slept with another?
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