Open communication and honesty are important in building good relationship to your other half. That is, if you want to grow your relationship with him or her. Because if you are hiding every time you gamble, it means, sooner or later, he or she will find out and that will cause more issues in your relationship. So better be open about your gambling activity and see where you can meet half way so everyone is happy with the arrangements.
That's right.
Honestly, I see no reason why anyone would hide their gambling habit from their partner, except of course they do not really value that relationship that much. There's absolutely nothing wrong with being a gambler and it shouldn't have to be to choose between gambling and your relationship, even if you're an addict, it's still important to let your partner know about your gambling habit because that can actually help you regulate or get over the addiction quicker since you won't have to always hide whenever you're doing it.