Why do people beg for a 2nd chance when they're getting dumped?

This is after they messed up the relationship by either being constantly disrespectful, they're lying again, getting drunk again, they got caught cheating, they disrespected your family or friends, being unreliable so many times, etc.

Then you're about to dump them and all of the sudden they're begging for a 2nd chance. Why? What's the point of it? That's like terribly messing up in your job and your boss fires you. Suddenly you want that job back. Ok wouldn't begging for a 2nd chance be scooping down so low, an embarrassment? They're already dumping you. Even if you're in the wrong, have your own self-respect and leave them alone.

Why do people beg for a 2nd chance when they're getting dumped?
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