The nature of a human being is to simply react, to throw back at others the medicine they mete out to you.
This is what Rava, the Babylonian Jewish sage, would advise: Ignore
the urge to return bad with bad, hurt with hurt, scorn with scorn
—and the heavenly court will ignore your scorning, your hurting, your acts that were less than good.
G‑d shadows man. Go beyond your nature with others and He will do the same with you.
When forgiveness can encourage more evit; ie insincere "deeply sorries" Though for the most part, not to be reactive is the best way, still in cases of pathological bullying, and making a situation that is hard to function in, calls for another reaction.
One must often, just forgive the action at the time of the event, but wait till full forgiveness till a total change of attitude.
"Feel good" ignoring and forgiveness when there is destructive behavior, can in itself be far worse than the original behavior.