When you view him with a "character analysis" you realize that the journey was hard for him in many ways.
He dedicated himself to protect Frodo, and once the Fellowship was broken he lost that aspect.
He had the weight of his true love on his shoulders. He must have been in a lot of pain knowing that it may be possible that he would never see Arwen again.
He put all of the weight of protecting the human race on his shoulders.
There are many, many others factors that add to who he is and why he does things.
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