I'm sorry that happened to you. I think its quite cruel just dropping someone like that, especially after 4 years. And talking almost every day. It is natural to wonder if he ever valued the friendship.
Sadly, there are a lot of cruel people in this world. And its even worse when they disguise themselves as 'nice' people.
If he had wanted to 'move on' he could at least have said something kinder, imo.. but then people who don't care do tend to show who they really are, eventually.

Something not dissimilar happened to me a few years ago. Dropped with cruelty .. 'had enough' … very familiar words. I guess he had had enough supply from you. and wanted new supply from someone else (narcissistic supply)