For example, I myself don't like my wife gambling, and when we were dating, I asked her if she liked to gamble, said no, that infact, she hated gamblers because they always appear irresponsible to her, I was happy for the fact that she does not gamble, because I didn't plan on settling down with gambler like myself, it wouldnt make sense.
And she also told me she hated gamblers as they always appear irresponsible to her, this made me never open up to her that I gamble , and lucky enough, I am not an addict, so it's very difficult for her to find out .
i can say you're lucky that up until now, she has not found out about your "secret" life in gambling. but i guess, when the time comes that she learned it, maybe, she will be more accepting if you can tell that you have full control of your gambling activities.
but if you are just playing occasionally, i guess, there's no harm done here. as you know how much budget you can spend and the time you allotted on the games.