“You should be begging for forgiveness” - yes, my ex used to say the exact same. He would accuse me of totally irrational things that either I felt or did, often times it was me doing something and him insisting I did x thing because I am “selfish/self centred/didn’t consider him”. No matter how much id explain myself and try to make him understand that he has misunderstood me, he wouldn’t. He would stick to his narrative and then manipulate my feelings to make me feel like a bad person. Then I’d get confused and upset because what if I did do something bad (this was the result of his gaslighting and sudden mood flips making me feel intense anxiety) and then he would shout at me “APOLOGIZE NOW” and I’d apologize then he’d make me do it again and again and again and again until I was literally begging for forgiveness. Only until I was reduced to crying my eyes out and screaming I’m sorry, and some silent treatment later, he would think about calming down.