Based on his insights about happiness, what does Crusoe admit is strange about his primary goal?

Crusoe's primary goal was to leave the island, and yet, based upon his insights about happiness..... he finds that he might just be happier here than in any other place or time. Note, directly after these thoughts, Crusoe calls himself a hypocrite, and he thanks God not for the place, but for the opening of his eyes to his "previous condition."

From this moment I began to conclude in my mind that it was possible for me to be more happy in this forsaken, solitary condition than it was probable I should ever have been in any other particular state in the world; and with this thought I was going to give thanks to God for bringing me to this place.