Of course, sometimes if we've had a bad experience, it can stay with us for a long time. If we let it fester, though, it isn't good. The Good Book said to forgive others. It took me years to forgive some who wronged me. I still have to ask others to forgive me when I have wronged them. You may forgive the person but not the deed as well.
I can forgive all I want, but I won't forget. If I could forget, then I might change....
I am like that sometimes. This happened during my formative years. It really colored my teen years and now, I guess, even my twenties....