How to be alone?

I broke up with him on Saturday. I’m shattered but I know it was the right decision.

I know I could fill the void - reach out to people from my past, get on an app etc., but I also know that will not help me right now. I don’t want to rush to fill the silence that I’m left with, but sitting in it is so painful.

No check ins, no little updates about their day, no one to go home to. How do I manage this?