How do you let go when things are uncertain?

Its almost been a month since we broke up. And we broke up due to me breaking trust, not loss of love. We still cared about each other.

In our final messages I told her I was going to therapy, and she said she was happy I was choosing myself and "someday maybe we can be in each other's lives again."

I know I need to move on and letting go is the most healthy thing to do, but the uncertainty about it kills me. There's a small chance we could get together again. I think it would've been easier if she said "I never want to speak to you again."

Anyone have any advice? Is this normal? Or is it just too early in the breakup to expect myself to be able to let go?