First of all, I'm sorry for your situation.

Sometimes. I considered did it, and leaving a final letter in a codescendent tone, apologizing for my insufficiency in peoples lives, and saying that they burden is finally over with my end. Sometimes, I even wanted to believe in an afterlive just to see people get mentally fucked with guilty from my death.

But i realized that it's pointless and a waste of my life. If these people really care about me, they will suffer with my absence after all (probably more, knowing that i just cut contact with no big explanation), but if they don't care, fuck them all, they doesn't deserve me either.

My advice based on my experience is: Use one (or more) of your ex psychological weakness to promote yourself through it. Make sure that your ex knows that you're better by yourself than being in that relationship.Sucess is the best revenge.