Hi, Kathy-
There was a very popular song titled "You Are My Heart's Delight," also known as "My Heart Is Yours Alone," originally "Dein ist mein ganzes Herz," an aria from the 1929 operetta The Land of Smiles (Das Land des Lächelns) with music by Franz Lehár. It was sung by every tenor on earth, and then some.
Here's a recording by Richard Tauber: https://www.youtube.com/watch?v=JtgmKpcgQ30

Here's the Wikipedia page for the song: https://en.wikipedia.org/wiki/Yours_Is_My_Heart_Alone

The lyrics have most of the elements you posted, but not in the order you gave them. So, is this the song your listener requested? Maybe. But the Tauber recording is certainly a classic, and Tauber's life story is quite interesting.

YOU ARE MY HEART'S DELIGHT
(words by Harry Graham or Smith, music by Franz Lehár)

You are my heart's delight,
And where you are, I long to be
You make my darkness bright,
When like a star you shine on me
Shine, then, my whole life through
Your life divine bids me hope anew
That dreams of mine may at last come true
And I shall hear you whisper,
"I love you."

In dreams when night is falling
I seem to hear you calling
For you have cast a net around me
And 'neath a magic spell hath bound me
Yours, yours alone
How wondrous fair is your beautiful hair
Bright as a summer sky
is the night in your eyes
Soft as a sparkling star
is the warmth of my love.

You are my heart's delight,
(repeat first verse)

It's unclear from the Wikipedia article if the lyrics were by Harry Graham or Harry B. Smith. It could be that Smith wrote another set of lyrics from the same song.