Lyric discussion by Dubious Merit 

I think this song is one of the most romantic songs I've heard.

The narrator's talking specifically about the gift of a pair of sunglasses - he's surprised and very happy, but also worried that he doesn't deserve them or that he'll ruin them somehow - but he's also saying the same thing about his love.

He didn't expect to find a girlfriend, and he doesn't feel completely worthy of her love - "I never thought I was worth much or that anyone would treat me this way" - so he's worried that he might do something "wrong" and lose the best thing in his life.

"I hope I don't break 'em / I hope we don't break up" - he's using the shades as a way to express his emotions, and admits this at the end.

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