I really don't have any advice to give you but wanted to know you've been heard.
It does sounds like you'd be better off without him and it also sounds like you realize this.
You will be okay (you've shown that) and he is not worthy of your time and head space.
I'm sorry you are going through this. Read the healing library in the upper left corner. Take care of yourself and make sure you eat and take fluids.
You are going to get a lot of good advice here that will help you walk through this crap.
The best thing you can do right now is to have no contact with your wh. Every time you have contact it will hurt. It's hard to recover when you keep ripping open the scab. He is lying and denying what you already know. He is gaslighting you and trying to make you feel crazy. You know you aren't crazy.
I know it hurts. We feel replaced and discarded. Try to do things for yourself that make you feel special. Pamper yourself.
You will get through this.
I know, deep down that I am better off without him. I think I needed to get it all out. Just feel so angry about it all. Probably, mostly at myself. I will maintain the NC regardless. We still have a couple of financial ties but I made arrangements yesterday so that I don't have to see him and felt good about that. I just have to learn to focus on the positive and I will get there.