Replying to Whipped like Cream

Ok, so im not sure why i didn't post this before, but my friend has a super bitchy gf and he is whipped like a slave. He has stopped hangin with his bros, worst of all lying to cover up he's hangin with her. Its been this way for like ever, and it legitimately ruined two of his friendships, but not ours. But anyway, how can these friendships be restored, i mean, these guys used to be ski bums together, this is serious. and how can we get him away from his gf? any advice ns? oh btw we've already tried interventions... is it a lost cause?