that most cheaters are never given a second chance

Source on that, also even then, the ones who are prove the statistic to be quite reliable. See here for the effects on both the cheater and the victim.

Considering the effects on the victim (suspicion even on non-cheating partners for years) you actually don’t deserve a second chance, even if you were on the straight and narrow for the rest of your life.

It’d be like you intentionally smashed his kneecap then stayed with him out of guilt to help him walk.