User blog:CallumMarston/Irish's unknown location

I know it's kind of a stupid question, but, what was Irish's location in Nuevo Paraíso after he abandons John? Or what was his purpose in going to Mexico in the first place?What makes me ask me this is when Irish says "Off I go to greener pastures". Plus in the newspaper that Jack can read, it says "Outhouse in Thieves' Landing". So he obviously returned to the United States. Another question I lay my mind on. Why did he return to the United States? Any answer will be accepted. Thank you