That sounds horrible. I’m sorry that the HR person was so shitty, and your boss sounds like a piece of shit tbh. Some people are bullies and just get off on making other people miserable. I’m glad your friend is talking to you again, making friends is tough and it’s more difficult as an adult. I’m glad the therapy is helping you.
There was a company in France where the suicide rate was so high that the cops investigated, he had been bullying people to suicide. If you encounter that kind of beheivour in your workplace report it instantly fuck the consequences. Working under a psychopath isn’t worth it especially if you have a good cv