second chances

There is a saying that everyone knows. "we all deserve second chances" but what happen when you get a third or fourth or multiple second chances. Cause i have i have screwed up so much hurt so many people. What happens to those chances at that point they disappear thats what happens there no longer there its like armor it can save you the first time maybe the second time but that third time its over no saving you. And i sit here just wondering why. why do the keep giving me these chances just give up on me lord knows i dont deserve them helps yourself and leave me.