Can you write him a calm and factual email, saying what you have said here. That your daughter doesn’t want to see him or listen to his nastiness or be questioned. That he is causing her distress, That she doesn’t want to answer his calls.
For these reasons your daughter will be taking a break for two weekends, and then she’ll see how she feels. State that you are putting her mental well being first and you hope that he can understand, and stop the questioning, nastiness etc so you can all move forward.
Definitely support your daughter and let her make her own decisions.