A client of mine had this problem--her husband came home every night and played video games. It wasn't like she was undesirable---actually, very smart, very sultry, and total hottie. Very classy, too.
She sought solace from me in terms of conversation--she'd hand around after meetings to talk with me about life, etc. Didn't complain about the husband but mentioned it once. She wasn't going for "tea and sympathy" but had I offered, then it might have led to that. All that being said, she eventually left the guy. Thank goodness for her strength to leave.
The one thing I learned about all of this is the huge number of guys who are this way with their women--they'll just play video games and ignore the great person right next to them. I don't get it...I really don't understand the nut-so quality of men like this. I also don't understand the patience women have with creeps like this...but, they'll patiently wait and hope that he'll turn around one day and see the light. Whatever.
The advice earlier is right on--don't get involved. She has to figure it out for herself. Namely, that a lot of guys are losers...regardless of how nice they might look in your dream wedding photos.