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will you (for the sake of peace, maybe to hide your envy, jealousy) continue to go gambling with that friend?
If we are having fun why not. I will continue to accompany my friend if he asked me to go with him in a casino establishment. How much I am losing is dependent on me since it was I who decides whether I will play or not.
And continue to lose your money?
Losing money is my fault since my friend only asked me to go with him and does not tell me to gamble my money away. I think this is dependent on how I control the urge of gambling in me. So for me I can avoid this issue while enjoying and be happy with the winnings of my friend.
- or will you tell him point clear that you are no longer interested in going to gamble with him?
Why not, if I do not feel like going no one can force me. It is my decision and only me can decide whether I go with my friend or not.
How are you gonna do it so he doesnt suspect that you are not happy with his constant winnings, when you are constantly losing?
I never envy my friend's success, in fact, I am happy for him so I believe there won't come a time that I won't be happy about my friend winning his gambling engagement.
Being jealous is not ok for a mentally healthy person, just think of it as a lucky winning series that may happen to you one day too. Learning from a friend and understanding his betting principles also can increase your winning chance, so better stick to the plan that can make both of you rich in the future. Everything is possible in gambling, we just have to learn how to play with the odds and control our emotions. Just my 2 cents.
I believe the reaction of the person on @OP's example is the real character of that person. The person is selfish and envious of others' success. The person put the blame for him losing in gambling on his friend when he has all the authority over his gambling activities. If that person don't want to lose big amount of money he should stop gambling or control his gambling bankroll amount at least.