Irving Berlin wrote this for his second wife, Ellin Mackay. His first wife caught typhoid (?) on their honeymoon and soon died....Ellin was Roman Catholic and the daughter of a prominent upper class family. Her father disowned her for marrying not only a Jew, but a (shudder!) MUSICIAN, to boot!
It was not until after their daughter was born (when Irving wrote Blue Skies as a tribute to her) a few years later that Ellin's dad relented and finally sort of made up with his daughter.
Ellin and Irving were married in 1925, and he wrote these words for her:

ALWAYS
(Irving Berlin, 1925)

Everything went wrong
And the whole day long
I'd feel so blue.
For the longest while
I'd forget to smile.
Then I met you.
Now that my blue days have passed,
Now that I've found you at last,

I'll be loving you Always,
With a love that's true, Always.
When the things you've planned
Need a helping hand,
I will understand Always, Always.
Days may not be fair Always.
That's when I'll be there, Always.
Not for just an hour,
Not for just a day,
Not for just a year,
But Always.

Dreams will all come true
Growing old with you,
And time will fly,
Loving each day more
Than the day before,
As time goes by.
Then, when the springtime has gone,
Then will my love linger on.

I'll be loving you Always ...

And Ellen died in 1988. Irving died the following year, at age 101.


Genie

PS,
I'm writing this from memory (based on several sources, especially the PBS biography of Irving Berlin from a decade or so ago). If I've goofed on any details, please correct me.