Hi Dee,
I noticed that you were the one who travelled to see him. And rather than rebuild your relationship and trust, he skipped all the steps and asked you to marry him! Then he has an adult tantrum when things don’t seamlessly go his way! Very entitled, that one!
It looks like you are already doing the right things. I would personally change my numbers, deactivate social media, if it gets worse move, and if possible work away from your old work address. Although it doesn’t sound like he’s a stalker as you were the one visiting him.
Stay Strong!
Inky