Look, I see some wobbling and vacillating here - it's OK we all do it, but I just want to be clear.
It doesn't matter what we want, how badly we want something, how nicely we ask, beg or cry. We won't get it, not a jot of it, unless THEY decide to give it to us.
I now don't tell X what I'd like to happen, because he is just as likely to delberately NOT do it so that I am unhappy and he wins.
The only way of perhaps getting them to wake up (and even then a VERY long shot, and so ridiculously against all odds as to be pretty much deemed impossible) is to get them out of our lives, write them off totally, detach, detach and detach some more. stop caring for them, or about them, cease to take anything they say seriously, they are not real people, they are an entity that is determined to destroy our joy, steal our power and abuse it for their own ego trip.
The sooner we give up ALL hope of them ever rehabillitating, and get on with our lives the better.
If we DON'T kick them out, leave them etc, then what incentive is there for them to change?
Think about it.
Those that wish their DP/DH will change back, will be that better person, you are deluding yourselves and wasting your precious life.
Give up on them. Get on with your lives.
IF they have an epiphany, and genuinely change, they'll know where you are and you can consider accepting them and their heartfelt grovelling apology.