Merlin swore and oath. An oath he swore not only to himself, but to Arthur. Protect the prince of Camelot with his very life. Forever. Merlin never regrets his last choices nor his path in life to always be by Arthur's side. Personally, he'd have it no other way. He only wished Arthur could know the truth. The whole truth. He was always told, when the time is right Arthur will come to know. With certain events rising, maybe that time will come sooner than destiny had in mind.