Why is he so upset?

So me and old coworker slept to together it was a mistake. I was vulnerable I was going through abuse with my mom. 3years later the new supervisor at my job is friends with the same guy who took my virginity… I stay far away from him. Then he told my sous chef I never speak to him. I was basically forced to speak to my supervisor? I never meant me and his friend had did it once.. I didn’t think I would end up liking him… so today we got into a fight it was over the fact my sous chef is super jealous of me. She likes the supervisor… he told her he has a gf… he tells me he doesn’t he just wants her to stoop flirting. Any time I talk to him she’s behind him 24/7. So I got upset I told I didn’t want to compete for a man at my job. Then I meant what she did years ago with his friend and me… omg he end up asking if we had something… I end up telling him he said I was selfish and that’s his friend… he said he can’t trust me… he stop texting a lot… I try apologizing
Why is he so upset? How am I selfish?
Why is he so upset?
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