Perhaps it has something to do with that.
And also, with the fact that he obviously has no class or dignity.
You can't control other people's behaviour. But you can control how you respond to it. You can respond with dignity or with blabbing to tacky tabloids and/ or magazines for money.
People often feel a need to "have their say" when they've been betrayed by a partner. And with celeb culture, slebs now have the opportunity to have their say. Then afterwards, they regret having done so. Margaret Cook always says how much she regrets having talked so openly about her rage when she found out about Robin's affair. It gave her the opportunity to let off steam, but it didn't help her.