Act "As-If" there is nothing wrong and he is going to be in a great mood and you are in a great mood. No matter how he responds you need to keep in your mind that it is NOT your fault. Keep cool, calm and collective!!
Stop stressing about it (easier said than done..yea, yea I know) as he will read it and whatever his reaction will be you can handle and you were just letting him in on the reality of the situation.
