Catch The Rainbow Lyrics Meaning

It's about a love that can end nowhere, a couple that believed they could find a happy ending (we believed, we'd catch the rainbow, ride the wind to the sun, sail away on ships of wonders...), but their love can only exist hidden from view, reenacted only from the time evening falls until dawn, when the poor stable boy can lay his wealthy lady (wearing a laced dress), on his bed of straw, but they cannot escape reality, and his agony about it torments him (so bless me... come the dawn). It's about two people with different status in society, not being able to create a life together, although their love for each other runs deep.