I can only offer is advice. I will help him through realization. He should just accept and move on cause he can never bring back what already lost. If he wants to bet again, I want him to take note next time that gamble only what he can afford to lose. I think such a big loss is enough to teach him a lesson. If he doesn't want to suffer again, then don't commit the same mistake, he'll just look like a fool if he do so.
Good point. If this person had developed a severe gambling addiction then any kind of monetary help would only enable the person and in no way help. As stated above the only help I could give would be to help the person realize there is a problem, take accountability, and figure out what steps need to be taken to overcome this overwhelming addiction. Without admitting to one's self that there is a problem don't expect any change only denials and dishonesty to self and others