You cant, ultimately people are responsible for their own actions and short of threatening them you can't to much to stop a person from living life how they want. Its a gamblers choice to gamble just as its a smokers choice to smoke. As much as it sucks to watch like an onlooker to a train wreck, sometimes you have no choice but to watch someone's vices destroy their life and negatively impact their family's wellbeing as a whole. We reap what we sow. G's wife is also somewhat complicit, if theres ever a time and place for wives to make their husbands lives hell or threaten to leave their sorry ass its when the husband gambles their family away into poverty to chase the rush. Sorry to hear about the suicide thing though, that sucks and its understandable why you are sensitive.