Wise man realizes that it is in human nature to make mistakes from time to time and nobody is infallible. Everybody deserves a second chance , an opportunity to make amends. You should be generous enough to give second chance but it will be folly to give chances to those who are unwilling to learn from past mistakes and take you for granted. If you have to live in this World , you can’t remain a saint who is forgiving forever. When it exceeds your limits, You have to bring your foot down and show your intolerance to mistakes being repeated.