As Woog says, you need to take control. Give him a day or two. But not more than that, you don't want him to start thinking that he can ignore you and your feelings. Then bring it up. Say something like, "I was hoping you would respond to my letter. Did you get it?" Then, if the answer is yes, he got it, tell him the truth. You put a lot of thought into that letter and you hope he will treat it seriously and give you a thoughtful response. You don't want a short verbal response. You want him to sit down and think about it. Then give him a day, two at the most, and ask again.
