It's a pop song from the sixties or early seventies, and I can't remember who sang it! I've googled the lyrics and found nothing, it wasn't a big hit, I guess. Think it's called I Know.
"I know
Whatever I could do, I've done,
Hoping to love you so no o-o-one
Could say I haven't really tri-i- ied.
I know
I'll always love you til the end
It's no use trying to pretend
I'm still in love with you,
I'm STILL in love with you
I'm still in love with you......"
Anyone recognise it!?