forgiveness

Question posed by a friend - at what point do you let "bygones be bygones"?

Grudges are never good to keep - generates too much negativity - kinda like a black whole where all the energy you could be using on better things disappears. This is such a complicated thing. Are they sorry? Are they even aware that they've hurt you? I'm not saying just forgive and forget. You can forgive and not forget and maybe in a way that's actually fairer to the offender, to know their nature and not expect too much of them. You can choose not to forget but still treat someone decently. You don't have to like everyone but you should probably be polite at all times - prevents escalation of tensions and maintains civility.
There are people I have officially forgiven but will never trust again.