Our past can be what define us but also it might be something that kills us. If the person you told your past mistakes to cant accept it, give it some time. Not everyone is open, not everyone can accept it.

baby whatever it is, your past is over and I will make it right with you. I will make sure that when you  thinking about it, it will only be good times. I will always treat you right. You have learnt from it and I will help you forget it and be there for you always.