Actually mistake is always, to err is human and to forgive is divine so in whatever way we wrong someone or we did a mistake I believe the person should be forgiven then it's now left for God to do the rest but holding a grudge against someone for a mistake he or she made either in the past or present shouldn't be so because holding a grudge makes you to hate someone not just to hit the person but also to have a bad mindsets against the person which is definitely not a good way to go I think we should all learn how to forgive and forget nobody knows tomorrow and nobody is also perfect anybody can do a mistake