I have no experience in this matter and I think gambling is not related to the relationship and it's only about the games.
If you'll analyze the question, it's not about the games but it's about if you hopped in to a relationship with a partner who's also a gambler.
and if we play the games with our friends, we need to tell them that what we have to get in the end will not disturb our friendship and it's only to have some fun with them.
Friendship over if you cheated on any of them. At this matter there are friendships that are starting to become weird after gambling his/her friend friend's money without any consent.
If you gamble with money that isn't yours and you didn't get any consent its like you stole the money. Why would you cheat your friends, when I gamble with friends, close friends, we never play in some big money, its something like for fun. I get your point, but maybe you exaggerated this situation.
I think op is thinking about gambling and relationship with a woman's, like marriage, or just a girlfriend. That isn't a problem if your gambling is in borders, if you don't spend more time on that then in anything else, on here to be accurate, same us for money, you can't spend more money on gambling then on her and house, than you aren't normal, and girlfriend or wife will leave you. I would advice any woman to leave her husband who spent more money in casino then in house! That person can sell house for gambling, leave that person before its not too late.
But there are many normal gamblers, we have some money and we choose to spent it on gambling, not on other girls, on cars or I don't know what, we like what we do.