I didn't say it was accidental. I said hurting her was not a deliberate action. And it wasn't. We could have had a brief affair, ended it, and she'd have been none the wiser. Our actions would have been deliberate but they wouldn't have caused her hurt if she hadn't known about them.
Him telling her he loved me and was leaving her was the reason she was hurt. Would she honestly have been any less hurt if we'd managed to resist having sex twice, until after he'd left her? It wouldn't have changed the reason he was leaving, would it?
In the perfect, straightforward world that some of you inhabit, where everything is very binary, you can leave your wife and remain completely decent and blameless, providing you didn't sleep with another person first. Even if acknowledging that you've developed feelings for that other person were THE only reason you were leaving your wife. That's technically not punishable.
So at the point you realise you want to have an affair with this other person, and you don't want to have to resist the urge, or lie about it, you can leave your wife and you haven't done a single thing wrong.
Yet the second you allow yourself to act on those feelings without leaving first, you become the devil incarnate. Even if you come clean about it almost immediately afterwards, it's no good. You are clearly just a liar and a cheat who can never be trusted in a relationship again.🤔