sometimes. I lost a friend who is not willing to listen to reason. He married her (and possibly still with her) she treats him like crap and he think he couldn't do better.I had a similar situation with a brother of mine. The more you try to voice your displeasure, the further he'll drift away. The only thing you can really do is trust that he's a smart enough person to see the truth in his GF when the infatuation wears off. And it will.