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There are many reasons why Castiel likes Dean Winchester.
He had a certain draw to him, like he was one of the heroes in the legions of stories the human race created and loved. Castiel knew that he was a noble man, a righteous man. His actions and thoughts -well, excepting the carnal indulgences- were that of a righteous man, a protector of the weak.
(What man was perfect anyway? God had surely made man in His image and He Himself was perfection, but the fall of mankind did much to mutate man to draw them away from God)
An… ant protecting other ants, Castiel could see the awe in that.
Dean cared not for the bigger picture, but in only how that could potentially hurt the ones he needed to protect.
He even always tried to protect Castiel, a warrior of the Lord, from those he considered a threat. To Dean, everybody was someone to be protected from “things that go bump in the night” -including Castiel’s brothers and sisters and God Himself- regardless to danger of himself.
There was something to be said about such unselfish purpose.
Nobility, thy name is Dean Winchester.
Castiel knew even in his doubts that Dean Winchester was someone to be trusted and saved. The solid trust he had in Dean, the inability to even doubt his intentions was one of the reasons he liked Dean.