That the man I married is the "true" him rather than the more recent one.
They're both the "true" him.
There's no way of getting past this with the truth intact unless you both recognise this.
He wasn't under some kind of spell, or coerced in any way.
He chose this.
The man you married always had it in him to cheat on you, to lie to you, to belittle you, to get you to leave your job and then despise you for it, to inflict a house you disliked on you when you were the homemaker, to react with anger for six weeks after his affair was discovered, to be nasty to your mother when she was supporting you, to be too ashamed of his toddler's pictures to display them proudly in his house, to think that adopting a load of designery aesthetic preferences made him better than other people...
You just didn't know it yet.
And he didn't either. It seems that it took a degree of success for him to become an insufferable arse. But it was in him all along, he just wasn't enough of a big shot to give voice to it.
But that's all a part of "the real him".
Can you love a man that let his ego run amok if he genuinely comes to realise what a dick he was?
I don't know. I think I probably could if I thought he was beyond further success causing a relapse.
But he seems very far from humility while he's asking you to help him not be a philanderer.
None of this is on you.
How much would you respect someone if you cheated on them and they agreed to help you dealing with that?? 