Does this help?
=====================
"It was twenty years ago today,
Sgt. Pepper taught the band to play
They've been going in and out of style
But they're guaranteed to raise a smile.
So may I introduce to you
The act you've known for all these years,
Sgt. Pepper's Lonely Hearts Club Band."
====================

A better translation could be made if we knew what comes after 'seit' (since) but that's the general idea.

"...seit ich dich verloren habe."

That's the rest of the sentence.

"I lost you ten years ago to the day"

or

"Exactly ten years ago on this day I lost you"

or

"It was exactly ten years ago today that I lost you."

or, varying the idea somewhat,

"Exactly ten years ago today you walked out of my life forever."

oder:

Today it has been exactly ten years since I'd lost you.

Thank you so much, guys!