I hate to play devils advocate here, but I'm thinking yes sending it could give you relief & grief.
What if he replies & twists all ur words around & basically belittles you, your feelings, emotions etc etc.
He'd have that last word. Knowing my nature I'd hate that & hate all the self doubt that might start again.
But that is just me & my thinking. He sounds like he won't admit it & just try to blame you.
Would you be strong enough for that?
You just don't want this to be a setback in your progress.

Do you have a support system?