How to get over a breakup with no closure?

My ex is a drunk who ignored me consistently when I was hurting and would also lie often. On his birthday he ended up lying to me saying he was with his family when he wasn't and obviously got drunk and ignored me all night long despite my texts/calls. I told him this would be it if he did it and he still ignored me all night - I removed him off all social media but haven't blocked his number in case he will text me but it's been two days and he obviously doesn't care enough to reach out to me.

I'm really confused because a few days before that he was saying how much he loves me, wants a serious future, and that he will do whatever he can to make this work. Just a day before the incident he said he would never do those things again and he wants to be with me. I know I can't be with someone who will so willingly betray me. I also know in the past he ALWAYS messages me or reaches out even if we don't talk for a while, and I don't exactly want to deal with that jarring feeling.

Anyway I don't know how to move on or let it go. I'm so confused because of his commitment/feelings just a few days ago, and now he has basically ghosted me? What should I even do? How can I let it go if I'm so stuck on why he would do this?
How to get over a breakup with no closure?
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