First off, obligatory I'm on mobile so the formatting is gonna be off, sorry.

I (20s don't want to share gender) want to start out by saying we did not have a great relationship. We had started talking last year and were going out for roughly a year. There were a lot of good things in it but he (30s M) mistreated me a lot.

A lot of past experiences that I've had makes it easy for anyone who is mildly assertive to walk all over me. I feel like I have a lot of unsaid things on how he made me feel and how the things he did made me feel disrespected, etc.. This isn't an attempt to seek closure from him, but to make it for myself by saying what I need to now that my brain is clear after being away from him. I know better to seek closure from other people. In the past I've been eventually able to move on without saying anything. But so many things have happened I skipped over misery very quickly and for the first time in my life I'm angry on my own behalf. It's hard to tell if I want to do this to make myself feel better or to 'get back at him,' but I know at the very least, I want to speak for myself.

If I write it out in an email, or print it out and mail it, there's no way for him to talk me out of what I feel or respond in a way where I have to listen. There were quite a few times I thought about what I had to say for weeks and took time to write out my feelings and in an hour he was able to make me feel guilty and go back on what I said. It has been nearly two weeks since we split and we're NC, so it's not that I've been ruminating on this for months.

I've always found the writing process very cathartic and I won't stop doing it, but the real question is do I bother sending him what I wrote? I'd like some advice from people who have been in similar situations.

TL;DR: Broke up with my ex recently and I feel that I have things I want to say to give myself personal closure but unsure if writing something and then sending it is really worth it.