Why do you care more about a person's past?

Everyone wants their other half to be perfect, and everyone will care about the past of the person they like, but since it is the past, let it be. If you love someone, you must love him now. No matter what a person's past is, as long as he is willing to change, you should give this opportunity. It is precisely because a person has done too many wrong things in the past that he will feel guilty about this person who loves himself now and will be kind to him.