Ignore these remarks. They are said to get your attention and reaction. Doing and saying nothing is the best way to respond. You can block his texts and not be bothered with this. What he thinks is not important.

I was like that too. I presented arguments in my head and practiced and knew that he doesn't make sense, but he is so confident. Till I realized he doesn't want to resolve things with me, or sound logical, he wants to hurt my feelings and keep me away.
You brought his message to you here and he told you F you and then said : ""please leave me alone" and wished all the best for your family or something like that, he was trying to mislead you. Typical abuser.
Winning is not playing their game and ignoring them.

I wanted to add that what concerns me if you answer him is that as you agreed he feels entitled to your life and that he will punish you as he did before.
You are not at a point where you have fully recovered , feeling complete and forgiven yourself, and he may convince you again that you deserve this treatment from him (deserved to be punished by him).
I know how hard it is, but every time you go back you go in deeper and it's harder to get out, because they don't give you clarity and make up excuses.

I'm not going back. And thank god I didn't respond. I'm just having trouble shaking the feeling that I need to convince him otherwise. It's like I want him to be sorry, but he never will be.I want to feel good just walking away and never looking back.

Because he was portraying the role of your judge for a long time. You have enough authority to give yourself the verdict and decide what you deserve. Especially after his abusive behavior.
That restlessness will calm with time. You will find meaning. And that he is a very special case, not statistics.

Sidi, that makes perfect sense. I've let him judge me for so long, I think I let his views of me define me. I'm glad I'm in counseling, bc I don't ever want to allow myself back into a relationship like that again.

How much time and energy did you devote, during the relationship, to reassuring him of your love, defending yourself against his accusations or put downs, etc etc? How much time and energy did you devote to proving yourself worthy of his love? I'm going to guess quite a lot. And it's habit forming. That's why you want to convince him now. Because that's a pattern that has developed, that's how your relationship was.

I went through the same thing, but I can tell you that with time and doing the work on yourself, it does get better. I got away from my ex more than 6 years ago, went no contact 5 and a half years ago. But he still manages to contact me every now and then, which I ignore. Last year, though, he got me - he contacted me early in the morning when I wasn't quite awake yet so I responded. He started his crap about how awful I am, just to get a response. In the past, I would have bought into defending myself, but now I just don't need to. I shut it down then and there and didn't respond further, despite him then playing every card in his deck - nice, nasty, apologetic, accusing, back and forth, up and down. It used to drive me mental trying to keep up and understand his emotional gymnastics - but now I see it's not his emotions at all, he was using fake emotions like holding a piece of string before a kitten. I was the one doing the gymnastics trying to catch on to his feelings and make sense of them. Now I see it for what it is - not just in my head (which I think is where you are at), but now I also see it with my heart. It made me a little angry, but only because I could so clearly see what he was trying to do to me. But it didn't affect my sense of self any more, I didn't feel I needed to convince him of anything, because his opinion genuinely no longer matters.

You will get there too. In the meantime, be gentle with yourself, accept that your feelings and thoughts will be contradictory for a while, and that's ok. You will be ok. He will not matter. One day you will be able to see stuff like that and laugh at how pathetic he is. But please don't beat yourself up about the fact that day is not yet come.

I am glad you realized that he doesn't have to agree with you. He abused you, and there is no excuse for that.
The person who got hurt, the person who is going to work on herself is you. And you are going to grow from this.
I also sense relief in your words. It will grow stronger.