How do people who ghost or cheat not get eaten alive by guilt?

A female friend of mine was ghosted by a guy she had been seeing for almost a year. He just abruptly blocked her on everything and when she went round to his place nobody answered - she was devastated but eventually realised she dodged a bullet and he’s obviously not someone she should waste any more time with.

My best friend was cheated on by his partner of 3 years, in his own fucking bedroom for a few weeks by the woman he thought he wanted to be with forever. That destroyed him but eventually he as well realised it was a blessing in disguise.

I’ve only been seeing someone for two months but the thought of ghosting them abruptly would kill me. She’s such a lovely person and to think of her excitedly messaging me only to never hear back as she wonders whether I’m just really busy then wonders whether something has happened then finally realises she isn’t going to hear from me again, that would make me want to kill myself.

But I guess people who cheat or do that sort of thing either sociopaths or mentally detached or spin a self serving narrative where they feel like they’re justified in what they’re doing. Or they’re just cowards who are too scared to confront them and break up. Or in the case of cheating they think they can have some fun without consequences… but still visualising your partner as you’re cheating would surely make you feel like shit.

Have you got any insight?