i remember reading a few stories about Rebbeim who were really abusive/hurtful and years later were suffering terribly. In the stories, the bachur who was marred for life is either called in a dream to the rebbe or somehow beckined and he goes to face the person who caused him so much tzar and he says to this broken but not necessarily remoseful person on the brink of death – I FORGIVE YOU! and then the rebbe recovers and life gets all better and the bachur talks about how wonderfully free he feels and all his gezeiras are lifted.
i think those stories are awful and they give the impression that the Rebbe was cleared of his suffering because he was forgiven (so he was suffering because a grudge was held?) and that the one who was hurt, is suffering with childlessness or lack of zivug. it doesn’t make sense to me. What feivel said makes sense. (by make sense I mean corresponding to all the other things I have learned about Emunah and Bitachon)
A better ending (and who knows what the real story is anyway) would be that the bachur is brought to the ICU unit and he says, “I am here to save your life. I am here to give you an opportunity to ask mechila so that I can forgive you with a full heart.”