I think he read the letter, and he is trying to ignore it, and hope it goes away. BUT, for the moment, let's give him the benefit of the doubt. Give him a couple of days after he gets home to say something. Then, you can ask him if he got it. Still calmly, kind of in an out of curiosity way. Then ask if he read it. If he says he didn't (probably not true, but more benefit of the doubt) give him another day or two.
