How about other lies that you uses because you can't admit to yourself that you've actually lost because it's a sign of weakness?
One can literally chose different reasons to lie inorder to cover up their loses but I don't find myself doing that knowing fully well I don't have any reasons to lie to a loved one. whenever i counter loses it seems to me as an opportunity to withdraw back from my activity, cause every loses is an opportunity to learn and restrategise.
We lie to others when we want to appear better in their eyes and avoid admitting our mistakes. I prefer not to take risks to the point where I would later have to lie or hide things about gambling, although I can’t say that in everyday life I’m 100% honest with everyone around me. And most likely, if such a situation happened, I would hardly share my losses with pleasure.