The way I see that gambling can destroy a marriage is if one of the two falls into addiction and does not let themselves be helped, and that person is so bad that they go blind, the other option is lies, that a person hides from their partner that they party at the casino, although it is very unlikely that it will be destroyed because of this, I consider that it is not something relevant and easy to solve, but it is silly that a marriage is destroyed by the effects of the casino, knowing that the casino is just for fun.