If you're in a relationship..

I would never give a second chance to a cheater.

Cheating. There are no valid excuses for this one, and there will definitely be no second chance. After all, that person already made the choice of hurting you in one of the worst ways possible - do you really think he/she loves and cares for you as much as what he/she tells you? Abuse. If you hit me even once then it's over. Being able to hurt your "loved one" physically, emotionally. and mentally all at the same time doesn't speak out the word "love" does it. No matter how upset or angry you get towards your loved one, your love for them will always keep you from physically abusing them. If he/she does it once, what are the chances that they get used to it and hit you again in the future?

For me, maybe I can but I can't relate you because I never experience this in my life. My friend who cheated his husband was forgiven by him because of their children and now, she's doing good and straight forward to their relationship along with their children.

I think cheating is the number one reason. but its not the case with me and my partner when we broke up. But i believe in second chances because we got back together. but it still depends upon the reason why you broke up in the first place.