Since there is no one available to him for counselling or for any advice and he will continue to gamble all day long or all time when he is alone and therefore he can easily become addicted.
Which means he has two problem:
The first problem is that he is addicted to gambling already and he needs to just quit. A friend that knows about how bad gambling addiction is can help. But if not helpful, going for rehabilitation would be helpful. But his friend can let him know that stopping the addiction comes from inside the gamblers mind which is the first thing to do.
The second is that he really needs a girlfriend if he tries to settle things with this wide but his wife not accepting anymore. There are better women out there.