All I'm saying is I doubt he used you. If I made that kinda deal with you, I would expect the same thing as he did. It's not taking advantage of you, there's no naivety involved. As was stated before, you agreed to a certain rule, but then expected an exception to the rule.

"I lot this, you lot that."

That's all that has been said. There's no "unless" clause. There's no "but I didn't get anything so far, why shouldn't I lot now?", that's no argument at all. That would actually be unfair to him, because you had your fair chance. Sometimes you just lose, that's all there is to it. I don't believe you got tricked, it's simply a deal you agreed to (a very fair one, that is commonplace in FFXI), and as such I don't think it violates common courtesy.