My ex messaged 4 years later

I received the following message few days ago:

‘Hey huynhhere, I hope me messaging you isn't triggering in anyway. I'm not the same person I was back when we were in a relationship. Sometimes I think about our past relationship and think about how foolish I was. I hope your life is going well. I just wanted to message you so you didn't think of me as some awful person in your mind for the rest of your life. We had some great memories that I still look back on sometimes. It looks like you got married and I'm very happy for you.’

Im just astonished that he had the nerve to message me. This piece of trash was cheating on me during the entire relationship and was constantly gas lighting me. When I ended the relationship, he refused to leave my house and eventually cornered me in my own dining room. He only left because I was texting several friends to help me. This trash even threaten to commit suicide if I leave him. I threaten to call the cops, so he stopped.

I don’t know if you notice but he didn’t even say ‘I’m Sorry’. I left him on read.