Okay, think carefully because this might be a BAD move for your sitch - or it might not - but have you thought about making an anonymous report to immigration about this? I understand they have a procedure for investigating "fake marriages"; interviewing the parties to see if they really know anything about each other, like whether they leave the cap on the toothpaste, etc.?
Just thinking, maybe OP would get thrown in jail for immigration fraud! But - most likely W would figure you were responsible, and wreak some vengeance on you that would make it not worth it. Still, it's a thought, isn't it?