But i think even if girlfriend is loyal she will never support her boyfriend gambling habit, because mostly people’s treating it’s a very bad thing and it’s kind of criminal offense. On the other hand wife and your family members will go against it very hardly, because they know that here you can lose money, so they dislike it and they want to protect you from big losses.
Yes, you are correct as it is very rare to see a wife or girlfriend encouraging her husband or boyfriend to gamble. The only exception I think can be something like the girlfriend is a gambler too and therefore she don't mind that his boyfriend also gambles.
Another reason can be some sort of motivation for the GF to allow her BF gambling. Maybe she has known someone who is gambler and he has made a lot of money. So she also hopes that if her husband will gamble, they can change their fortune. Such are unrealistic dreams that rarely come true.
When a woman with think what you are doing is not bad as a gambler is when you are making profits from betting. In a situation when you are not making money as gambler, the woman might see you as wasting your time and money on betting when you supposed to use the money and take care of her. Some women can be very dramatic which is why it depends on the particular woman.
There are women that don't see anything wrong with gambling and would want you to gamble more so that it can increase ethe chances of you making profits so you can take care of important bills in the house. Some would like to keep praying for you so that you become successful as gambler do their will be enough funds to take of family bills.