Why hasn't he deleted me off?

I was best friends with a guy that has a girlfriend. One night after a lot of drinking, we made out... We decided that we were going to tell her and I sent her a message. In the message I made it sound like I made the first move and he rejected me. This is NOT what happened. He claims that he doesn't remember exactly what happened. After I told his girlfriend, he stopped talking to me... She deleted me from every social media platform and told all my friends.

Why hasn't he deleted me?
Why hasn't he deleted me off?
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