OP exact same thing happened to me a few years back.
We were about to move in together and were totally loved up. Then randomly he broke up with me as "he didnt love me and wasn't feeling it".
Completely out the blue. 2 days before he had bought me a tiffany ring 'just because' and told me how he couldn't wait to move in. Then he came over. Told me he didn't love me, got his stuff and his parting words were "dont be ringing me constantly, drunk texting me or crying".
Well i was in shock. So much shock i didn't even cry or say anything. Just said "okay then" and let him leave.
Anyway guess what? I never once spoke to him again. I didn't text him. I didn't ring him. I didnt demand an explanation. I literally have never spoke to him again.
You see his comment of "dont be ringing me.." really riled me. He obviously expected me to be a mess and in bits and begging him and wanting to know what had changed.
I was in bits.. In private. I rallied my girls around and drunk proseco and ate chocolate.
1 year later my ex happens to see me out in public at tesco car park. But somethings changed. I'm 2 stone lighter wearing a tight dress and heels with a rocking hot body getting out of a brand new Mercedes 4x4 with my successful boyfriend in his suit from work.
The look on his face!!!! He was looking worse for wear. I had upgraded my entire life massively.
I am so happy i never contacted him again after he dumped me. Literally my proudest moment. The last thing he said was not to go crying and begging him and sorry he had broken my heart blah blah blah.
Clearly expected me to fall apart and demand to know why.
Then he hears NOTHING from me ever again and he sees me looking fit as fuck with a successful businessman for a boyfriend a year later. Gets me everytime!
DO NOT CONTACT HIM! I wish every woman could experience my moment i had in Tesco car park. That experience taught me that never will i chase a man. I will just live better and do better!!