Most of the people in my life that I have forgiven ad nauseum (to most) have been people that I love. I do so because part of the reason why they are doing these things is to test my love for them. At some point, depending on how much I love them, I can totally shut off. All feelings for these people have stopped. It doesn't have to do with any countable times but not being able to take anymore at a certain point in time. Only once has my love been won back under those circumstances, and I am more than thankful that it was. If not, my living life would be hell.
How often have you been in love?