Gambling does have a connection with divorce.Oftentimes, many gamblers hide their gambling activities from their spouse.Meanwhile,studies show that couples where one partner has a gambling problem, they're more likely to separate or divorce.In essence,gambling,especially compulsive often damages finances and trust in a marriage.
If they cannot fix that problem and don't talk about it. The relationship is at risk and likely to get separated. But even if the other one is a gambler, they can have a setup wherein the gambler can continue to do it but with limit. Everything can be done in talks if they have to do it. For as long as they understand each other and there's a limit to how much one can gamble to, it should work fine.