Actually It's Not For Me But It's My Friend Who

Actually it's not for me but it's my friend who really needs help, he is a good father but he encounter a problem because his wife fool around,by that time he's attitude change everytime he ask money to me until I ask him how come your losing weight, and that time he confess to me that he is hook w/ mentaphetamine and or amphetamine for more than 1 year, he like to be cured, I advised him go rehab but he no like any advice to help my friend?