It was a staple at a lot of weddings and wedding receptions in the late 60s and early 70s- the kind where the ushers and best man wore lime green tuxedos.
The twisted thing is that, lyrically, it's NOT a song about a healthy relationship with mutual devotion and all that- it's actually a song of despair and self-pity sung from the POV of a guy who has never even got up the nerve to talk to the woman he is obsessed with. just check out the lyrics:
Cherish is the word I use to describe
All the feeling that I have
Hiding here for you inside
You don't know how many times
I've wished that I had told you
You don't know how many times
I've wished that I could hold you
You don't know how many times
I've wished that I could mold you
Into someone who could cherish me
As much as I cherish you
Perish is the word that more than applies
To the hope in my heart each time I realize
That I am not gonna be the one
To share your dreams
That I am not gonna be the one
To share your schemes
That I am not gonna be the one to share what
Seems to be the life that you could
Cherish as much as I do yours
Oh, I'm beginning to think that man has never found
The words that could make you want me
That have the right amount of letters
Just the right sound
That could make you hear, make you see
That you are drivin' me out of my mind
Oh, I could say I need you
But then you'd realize
That I want you
Just like a thousand other guys
Who'd say they loved you
With all the rest of their lies
When all they wanted
Was to touch your face, your hands
And gaze into your eyes
-that isn't anything remotely like love and happiness. It's self-loathing, despair and fixation. If the guy whose being characterized in this song ever had any role in a wedding, he'd be one of the cater waiters or outside parking cars.