they used to have a post to your ex thread in here, check a few pages back in this section and i am sure you'll find it locked because it didn't get posted on for the last 30 days but it was for people you no longer really speak to, imo, not ones you still have good relationships or friendships with.
maybe he has news to tell you and is nervous and that is why he didn't reply before he went away but did it day he left on another email so he wouldn't have to type or talk to you during that full week until home so he can think on what he will talk to you about? people only put others off if uncomfortable about talking about something to that person, so think about that when you do talk and i agree don't bring up you know about the message and that he was at work when you 1st mailed him, he should see your email when he goes back to work the next week and he'll know you know the truth and that he deliberately avoided you.
When I tell the truth, it is not for the sake of convincing those who do not know it, but for the sake of defending those that do.
William Blake