My fiancee hates cheaters. I'd assume most people do, but she really hates them as her previous partner cheated on her and it was very traumatic. They had just moved in together and she was fantasizing about the wedding and having kids, and he blew that all up.
She has zero sympathy for cheaters. Her dad also cheated a few times and MIL keeps taking him back but it has clearly hurt her self esteem.
Anyway my dad cheated on my mom about two years ago. it was this big dramatic affair, him acting like an idiot claiming he'd never be in love before, and then leaving my mom. He is seriously a different person now, affectionate, he seems to have emotions, it is weird.
My mom claims she doesn't care. i mean I know on some level he must have hurt her ego, but I don't think she was that hurt or traumatized, certainly nothing close to what my fiancee experienced with her ex. My mom and dad can be in the same room, act civil, and neither seems uncomfortable.