What is one meant to feel after a breakup?

I just feel empty.

And hurt.

I know it was my fault, but it still hurts.

What am I meant to feel? How am I meant to act? I feel like a shell that has had all the life ripped out. I don't want to see anyone, I don't want to hear anyone. I don't want to interact with anyone in any way.

I want to sleep and do nothing, yet the more I try the less I sleep. I just don't know what to do.