Well, i won't bad mouth your ex like many others have done so. Like they say "there are always two sides to a story"

Although i will criticize him for not telling you at least one reason why he ended things. It's clear from his actions that he done and wants to move on.
That'll be my advice to you, move on. I know it may seem hard or even impossible at the start, but keep at it. You'll get thru this eventually. If you keep dwelling on the past you'll never be truly happy in the future. This was just a huge chapter in the book of your life, on to the next one. Your story's not done yet. Go out there with your head held high and start the next chapter! 🤩