I'm reading this as the difference between walking away or letting go and not caring is not giving a fuck. I can walk away from someone or something but I can still wish them well. To me not giving a fuck is NOT wishing them well. I may need to get someone out of my life but rarely do I become vengeful or even antipathetic.

@kmdskit3 Yeah we're probably down to semantics. To me it just means not caring about things that at one time were very important to you. Sometimes the importance you assigned was misplaced or even delusional, sometimes it represented a perfectly reasonable expectation that was foreclosed for you by bad luck and/or bad actors and/or your own ineptitude. Regardless, sometimes the train has left the station and there's no going back for a redo or second attempt, and you have to accept / process / integrate this as the loss it actually is.

It has nothing to do in my thinking with whether I wish a person well or not. That to me is an entirely separate issue. I wish my first wife well, never held a grudge about a marriage that caused me and my children incredible pain and disappointment, but it still damaged my ability to trust future partners and to trust the whole process / institution of marriage after that point. To divorce that person was a decision to say "fuck it" to my dreams of sharing a life with her, of being "the husband of one wife", of salvaging something I could describe as a normal childhood for my children. I had to flush all that down the drain, and I wasn't happy about it. That doesn't presuppose that I had to hate or demonize or hurt my wife back. It was just processing a loss; whether I conducted myself honorably to my wife was to me a separate issue. I said "fuck it' to my dreams, not "fuck you" to my ex wife.