hgc,
money, appearance, personality, emotional state, health, whatever.
They are all excuses the cheater uses to justify something really bad, an abuse towards their partner, and allow them to further indulge or not feeling guilt for what they chose to do.
There is no excuse, they are thrown at you because they know they wronged you horribly, instead of remorse for seeing your suffering, they will shift the blame onto you, hitting you more so you will completely collapse and not present them the mirror where they can see a truly ugly reflection, because they can't stand it.
You are bleeding from the wounds, if they can bash you lower, then you have no fight left to even protest them for the pain you have to suffer for their choices.
That might be a bit uncomfortable for the wayward, but after all it is your pain, you do feel it, they don't, is a price that they are willing to pay instead of facing their own ghosts and realizing they are the villain and not the hero in their own story.
You already suffered for their ego, you are already crushed, so won't make a big difference if you carry a bit more pain if that means they do not have to confront their ego and realize that they feel pain too.
Yes, this means is intentional, conscious or not, he does not give a crap about your pain. Shame is not "I deeply hurt to see your suffering and I want to help you" (that would be guilt and remorse), it is more a fake apology as "I am sorry that you feel that you have to suffer, like my own happiness was an insult to your feeling, because I never meant to hurt you, you just took it too personal".
Like you are overreacting.
Get it?
He is not in a partner place right now. He is in the cheater place, both are, and they don't care about nothing else than their ego.
This does not make it worth to suffer for this kind of people, it just show you who they truly are, so you can reclaim your agency and dignity by seeing that, accepting that, and realizing you might be the suffering one here, but you are not unworthy and for sure not guilty.
Set the values properly, you stand way taller than them and their behaviors.
And that is what they fear to see either.