Guilt vs. Defeat

I'm not so sure how these two words differs from one another in a context of a failed relationship. But here's my bits about it: People say their guilt are eating them alive and that the are sorry for what they did, but is it really true? Lol They say they are sorry multiple times, but it isn't accompanied by actions that shows they're truly sorry. Do they just feel defeated after realizing that what they did is wrong and that they chose the wrong choice? Maybe. After realizing that they lost something important, they became sorry. They feel defeat first, then they became guilty, then comes the sorry. Insincere apology. It is a manipulation.