I think this "I've forgiven him" stuff is bullshit and it irritates me when I hear it trotted out as if it's some enlightened Christian necessity. Jesus forgave us so we must forgive others.
Why would you ever forgive someone who has deliberately done an evil thing without remorse? People like that haven't asked for and don't want anyone's forgiveness. So why give it to them?
To follow the Christian model, one would have to ask for forgiveness of sins, just as Christians must ask Jesus for forgiveness of sins, or, as they say, accept the gift of forgiveness that He is offering.
It's not automatic, even according to themselves if they are truly following the model set by Jesus in the way he provides forgiveness of sins to Christians.