DH has teen kids from previous marriage. We've been married for 9 years. The reason his prevoius marriage broke up was due to his ex cheating on him. He tried very hard after he found out. She said she'd try, then was caught again etc (with different people). Eventually she said he has to learn to share her as she's just too gorgegous for one man to own, then he filed.
The issue is that she tells DSC DH abandoned them (for me). I met him a year after the divorce. DH never told DSC why they divorced (obviously). They blame him, treat him awfully (it seems the ex spends the entire time with DSC slating him). This Christmas was a disaster - DSC blaming him again and again how he ruined their happiness, how he doesn't pay enough (he pays twice as much as per the settlement and the kids know no need in anything).
Question: is there an age when DH can finally say the divorce was not his fault although he filed for it? DSC are early and older teens. Of course saying that will be meaningless unless he says why he did it.