Read about trauma bonding. Read the book ‘living with the dominator’ by Pat Craven. Let the brain chatter go on until your head works things through. If it gets too much tell yourself you will put an hour aside each day to allow your head to sort it all out. Or ping a rubber band on your wrist to distract your thoughts. I woke up every morning thinking of my ex. It’s natural. Contact your doctor or women’s aid to talk it through. Don’t believe anything you hear about his new gf. Tell yourself you don’t miss him, you miss the illusion he created when he wasn’t being abusive.
Recovery is a real roller coaster. The book I recommend says they will buy aftershave, tidy themselves up, get a new gf and let you know. All designed to hook you back in. Don’t let him. Enjoy the peace, it will get better given time and no contact ❤️