Some people deliberately make mistakes, So that they can have a chance to apologize not only for this mistake but indirectly also for those they felt guilty about but afraid to accept in front of you...
So when someone apology to you, You should forgive them for all their past behavior incuding those they aren't pointing out or accepting. In this way you and all other can live cheerfully and happily without regretting or thinking about past.

© Mjk_011wish