but then one day he or she has bet it all and lost it all. You've got nothing left (and no savings either). What's your reaction? Has this ever happened to you?
I would be really pissed off, angry, mad and betrayed by the closest person I had in life. It has never happened to me, and I hope it never happens, but inevitably we are under risk in this life, because we never know the true nature of other people with 100% assurance, even the one sleeping by your side. Anyway, I don't think it's the kind of thing which happen often.
To lost it all means to lost patrimony, funds at bank, vehicles, investments, which can't be lost all at once. It must be a progressive chain of events, which will trigger the attention of the husband or wife before the other person spends everything gambling. Moreover, if the person insanely tries to sell their belongings instantly, there are financial or banking managers who will spot something is going wrong there, and will call the husband or wife to tell them about the strange behavior of their partners before they commit any irreversible mistakes.
In every cases, I would never wish to be by the side of someone so unstable like that, ready to annihilate the progress which took an entire life to achieve in a matter of minutes in a gambling session. This kind of person is destructive and will make you ill in the end, just like him/her.