The Situation:
I have a fiance, and he has a twin brother, who happens to be my very best friend in the world after my fiance (my fiance loves that I get along so well with his twin). This twin brother has a long-distance (cross-country) girlfriend, whom my fiance and I do not like due to some PA actions of hers in the past. We are both doing the minimal contact to prevent conflict thing.
The REAL problem:
Now, if fiance's twin seemed happy with this girl, I wouldn't have any problem, though I may still voice my concerns about why she isn't good for him (and she isn't, though he is good for her). The problem is, he seems HORRIBLY unhappy. He says she makes him happy, but whenever she calls, he looks really upset, and SAYS it bothers him. If he complains, she throws a hissy fit, and she basically is controlling him through emotional blackmail.
The Solution I'm Betting I'm going to get:
I've already voiced my concerns politely, and he has heard, and done nothing because of them. I know I have to sit back and watch this girl (she's 20, but she's rather immature in many ways) make him miserable. He's a great guy, but very bad at standing up for himself, so she is able to walk all over him, and take advantage of his kind heart and caring nature.
I know I can't do anything, but is there anything I can do other than sit back and WATCH?