My advice is: Dont tell her you gamble. And if she knows or you cant hide it, just don't talk about it, make her think its just very small ammounts. Because no good can come from this, even if you win all the time.
I have a stupid friend that is having problems with his chick because he cant keep his moth shut and told her about some losses.
Mine knows i bet, i couldnt keep my mouth shut either, but i just told her about some wins. But im around zero anyway and we dont share finances. Im also trying not to talk about it anymore. Funny thing is, she got an impression that this is easy money and wanted me to 'teach her too'. And she doesnt know anything about sports
