This is totally my wife's attitude.
Your wife can see how much it pains you that she has begun cuckolding you with someone you know, so she has thoughtfully decided that it would probably be easier for you to accept your new role in her life if you don't know anything more than that. That way, there will not be the problem of social awkwardness when you interact with the man she is now sleeping with -- because you won't know for sure who it is.