Am I wrong?

My boyfriend\baby daddy of two years. Is so upset I accepted his friend on Facebook. He deleted me and threaten to block me. I used to have his friends on Facebook and we liked each other post. He didn’t like that so I stopped. But I recently accepted his friend. He blew up. And told me i was fucking up and he was gonna added bitches. Told me I was retarded and needed to be single. What should I do?