Why hasnt he called?

He hasn't called because either because he's busy or because he doesn't want to. If it's the first, he'll call eventually when he has less on his plate. If it's the second, he won't, but you'll still be fine because who wants to be in a relationship with a person who isn't interested? Best bet is to just relax and let things happen. If you want to find out, try calling him and asking if he wants to get together in the next couple days. His answer will probably tell you if he's interested