~snip
Sometimes even financially stable people get addicted to gambling. In your friends case maybe he started it as entertainment but later it slowly turned into a gambling addiction. The most tragic situation is when they take a big loss and gamble more to recover the lossing fund. Later it is seen that the big loss is gone and also extra fund he put to recover are all gone. There are many people who will sell their houses and all kinds of things to gamble to recover their funds.
If possible support your friend emotionally and give him some ways to get rid of this addiction so that his life can run a little better in the future.