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.
When it comes to having a partner, they must accept our likes and dislikes , Otherwise why have a partner where you have to do things you don't like? that's Something I find very absurd, if the person who is with us doesn't accept us, we must change them, because if we are not going to be inflexible because of our partner, that's not the way to go.