You can't change the locks but you can lock the door. You absolutely can put his things out and tell him the two of you are now history.
Since he has crossed the line into outright aggression, please call the police. They will send someone out to record the damage and take details. Then you can clear stuff up.
You should ask them how to get a non-mol order. You can get one even if the home is owned outright by the abuser.
Please don't try to hide what has happened or clear it up or cover for him. The only person who is protected if you do any of that is him.
Please don't leave MN - nothing you have said wouldn't be true of hundreds or even thousands of women.
Call the teacher and say a family thing has come up and you can't see her today, but you would like to reschedule at mutual convenience. You don't have to go into details if you don't want to.
Tomorrow some time, please call Women's Aid - 0808 2000 247, and leave a message telling them when they can call you back to talk things over (if you don't get through right away).
I gather from your comments there that this man has made your life miserable for quite a while, and maybe this incident is the one that is a gift in disguise for you - maybe your beloved grandad is cheering you on towards better things?
You are not the failure here, and you are not the one who has done everything wrong.