It was also because of when he was stabbed at Weathertop by the Nazgul, the Morgul blade was still causing him pain.
Remember how he said how long it had been since he was stabbed at the end of the movie, and how it had never really healed? He had to leave Middle Earth because it would have continued to get worse there...I think...
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28 days...6 hours...42 minutes...12 seconds...
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