Usually addicts will realize when they lose everything, for those who have a strong mentality he will get up and get out by himself but if he doesn't have a strong mentality he will definitely end his life without thinking about his future, but as a friend I still pay attention to him so he doesn't do anything that harms himself.
Not all addict realized that they're addicted, some just think they're doing what everyone else who is gambling is doing and when they have gotten to this stages, this person need help in quiting because if he continues he might take decision that he'll regret in the future.
Gamblers with strong mentality can still be broken down with addiction or realization of the lost that they have had when they get their senses back. Some gamblers has lost too much to gambling that it becomes difficult to quit because when they're paying they have hope.
They have hope that one day they can win big and get back all the money they have lost to the house but if they stop Gambling it means they have given up on winning back the money they have lost. This reason is why they keep playing without realizing they're making matters worse.