Like I said the answer is a paradox don't ask me I got that riddle out of a book I read once. But the paradox makes sense because there are infinite possiable ways with the riddle. He can be lieing or he can be telling you the truth but you don't know because he can be still lieing even when he says I am telling the truth. And then he can say I lie and really mean it but you still don't know because that too can be a lie thus resulting in a paradox of an infinite situation.
You see how it is? Its endless there is just no answer to the question everything he does you don't know whats true and whats not unless he told you but once again that can be a lie. You see theres is just no way out of this paradox.
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