Envy is human nature but try to channel that inner peace to not make it big of a deal, you see your friend winning big time, just take his advice on what you should place bet on, i mean since his winning rate is so high just following his every decision is probably the way to go.

being salty is one way of you having your downfall, whenever I got a friend that are so lucky I probably just outright try to follow them without thinking twice if the worst scenario played out and i'm losing due to following him, well too bad maybe i'm the chosen one bringer of bad luck
but if the opposite happen and we won, then I guess i'm gonna have betting guru that i gonna follow faithfully. always consider it as an entertainment at the end of the day.