I didn't know that using his address to cash out was an issue. I don't really know how to sell it and he made it simple.
As I said this was the first time playing, only got this account but I already see how anything is used as an excuse not to pay.
Who is he? Your friend who is an old player at Fortunejack? Just in case your story is true and if he is an old player at Fortunejack, he would not even suggest you to use his address because he should know that it will make a problem for his own account and your account. To be honest, I doubt that you do not know how to sell it. If you do not know how to sell it then how you did you buy it for deposit? You made ETH deposit and I believe you bought it somewhere and logically you are able to withdraw it to the address you use for deposit. If the story you say is true, then the one you should blame is your friend and yourself for not reading the terms of Fortunejack regarding multi accounts.