Ok, I will help. Give me your number and I will call you in a week...
J/K
Well I guess it is possible he could have added your number wrong, it's also possible he doesnt have the courage to call, also could be he got back with his ex(or another girl), it could be that he is no longer interested. Or it could be that you missed his call somehow?!? We could keep looking for reasons why he hasn't called yet but, is any of them truly going to answer your curiosity on why he hasn't touched base with you yet? Maybe so, or maybe not. If not then the only way to find out is from him. There couldn't be much harm in calling. He did give you his number for a reason, I would think.