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Merlin has a lot of reasons to dislike Prince Arthur, even if his mum doesn't understand half of them. He's not going to become Arthur's friend, go to Arthur's birthday gatherings or stop by Clarence House on one of his rare days off to 'say hello' because Arthur is weird, okay? He's weird and Merlin wants nothing to do with him or his strange tendencies.
If only Merlin had listened to his own advice...