They have to want to change though. If he wanted to be better for you he wouldn't have put you through all of that in the beginning anyway.

Most likely he just got better at lying and hiding it.

This is one of those situations where you can be realistic and prepare yourself that you will in all likelihood get cheated on OR you trick yourself into believing he might not cheat.

Like logically though, there's zero proof he won't cheat.

I worry you might be here hoping for a good story or evidence that your relationship might have a chance but it seems pretty doomed from the start.