I'm Building Up to an Awful Letdown

I'm like Humpty Dumpty,
Up on the garden wall,
I'm riding high,
And who can deny
That whatever goes up must fall.

Poor old Humpty Dumpty,
He got the toughest break,
And yet his fall
Was nothing at all
Like the tumble I'm gonna take!

I'm building up to an awful letdown
By playing around with you.
You're breaking down my terrific buildup
By treating me as you do.

My castles in the air,
My smile so debonair,
My one big love affair,
Is just a flash;
Will it go smash
Like the nineteen twenty nine market crash?
I'm building up to an awful letdown
By falling in love with you.