Honestly, I would give him some time and then hopefully he will get back to you. I am often in the same position as your friend- I have school, two jobs, a boyfriend with two kids and a lot of the time, I have to worry about those things before I can worry about the other things in my life. Many times my sister will text me and I literally will not have time to respond. It is not because I am mad at her or ignoring her-- it's because I literally don't have time to sit there and text with her for a few hours. So, I would give the guy some time to sort out his other stuff and then I am sure that he will get back to you.
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--Nyx-- What an astonishing thing a book is. Across the millennia, an author is speaking clearly and silently inside your head, directly to you... Carl Sagan