Endless Love is a 1981 romantic drama film directed by Franco Zeffirelli, starring Brooke Shields and Martin Hewitt. The screenplay by Judith Rascoe was adapted from the novel by Scott Spencer. The original music score was composed by Jonathan Tunick.

The film was a moderate box-office success, and the film's theme song by Diana Ross and Lionel Richie, also called "Endless Love", became a #1 hit on the Billboard Hot 100, and was the biggest-selling single in Ross' career. (wikipedia)

Here's the lyric:

Endless love
(Diana Ross and Lionel Richie)

My love
There's only you in my life
The only thing that's right

My first love
You're every breath that I take
You're every step I make

And I
I want to share
All my love with you
No one else will do
And your eyes
They tell me how much you care
Oh, yes you will always be
My endless love

Two hearts
Two hearts that beat as one
Our lives had just begun
Forever
I'll hold you close in my arms
I can't resist your charms

And love
I'll be a fool for you
I'm sure
You know I don't mind
You know I don't mind

'Cause you
You mean the world to me
Oh, I know
I know I found in you
My endless love

Oh
And love
I'll be that fool for you
I'm sure
You know I don't mind
You know I don't mind
And yes
You'll be the only one
'Cause no one can't deny
This love I have inside
And I'll give it all to you
My love
My endless love...