Along with watching the podcast with Lundy Bancroft, you should also take the time to read (or listen to) his book "Why does he do that?" It's free
https://archive.org/details/LundyWhyDoesHeDoThat/mode/2up
You seem to feel very guilty about your resistance to his awful behaviour. You should know that guilting is a KEY weapon of controlling men. Check out Chapter 3 "The Abusive Mentality".
It shows how the controlling man routinely deflects criticism back onto the partner so she ends up apologising for things she didn’t do or apologising for her resistance to his shit behaviour. Over time, the woman's "burden of guilt" keeps growing.
Add in constant pressure, emotional blackmail, DARVO, lovebombing, and the sheer RELENTLESSNESS of it - it's psychological warfare, OP.
The controller has finally got the woman when she stops actively resisting. And it doesn't stop there. He'll keep hammering and hammering and she'll get smaller and smaller until she's just a shell.
You're still resisting - brava to you! Keep resisting, and get him out of your life.
Going back to your original question - can he change? My answer, like that of pretty much every PP here, is that there is NO CHANCE - ZERO - that he has changed or will be able to sustain his so-called changes.
And btw, he's still abusing you with his guilting, so he hasn't changed at all, OP.