Sometimes a situation just turns out to have the worst possible outcome, and you could have told from the beginning.
You had spotted the discomfort in approaching it, the signals, the opposition of others. You had noticed that nothing was going the way it was supposed to. You had called it difficult, wrong, impossible. You had said many times you were giving it your best, and despite that, you could not see any improvement. You had wanted to quit and give up, in different occasions, and yet stayed in it until the very, inevitable, tragic ending.
This is self-sabotaging.