1) In past, I might be wrong and didn't forgive someone; then I realized my fault. Now, I don't repeat my fault anymore.
2) This 'forgiving' may vary from person to person. It can happen that I didn't forgive someone for his/her doing, but I may forgive someone near-and-dear one for doing the same.
3) It may occur that in the past, someone did something wrong intentionally and so I didn't forgive him/her; but now if I see someone doing the same wrong thing unconsciously and unintentionally, and after finding own fault he/she has intention to be changed, then I'll forgive him.