"I am willing to accompany you to the end of the world." This sentence does not make sense in any aspect. First, even a three-year-old child knows that the earth is round, and it will always return to the starting point after going around it. Secondly, the earth revolves around the sun, and you can travel farther by staying still than by walking around. So the most romantic words should be: I want to stay here with you, at this moment, in this second, traveling thousands of miles in a day, until I die.
You know, there is a person in the world, and any love words you use to match him will feel tacky.