I've fallen somehow
Feet off the ground
Love is the cloud
That keeps raining down
These lines combined are a metaphor for love.
To make things clear, a diagram of a water cycle can help out:
Usher is the water. He evaporated up to the clouds where he has reached the highest point in the “love cycle”. Like the water cycle, there’s point where people fall out of love. When they fall out of love, the highest point has come to an end their partnership descends.
To help improve the meaning of these lyrics, visit "Climax" by Usher Lyrics and leave a comment on the lyrics box