Could someone help me translate a song? Any Spanish speakers

See a translation

@moyer
Sit down here with me
Sit down, I want to talk to you
What happened is clear
It's that I stopped loving you
A long time without knowing
What it was that you wanted
But I knew inside of me
What it was that I wanted
Nothing..nothing will be what it once was
Only illusions without knowing
How much longer to understand
That that was yesterday
A long time I waited for you
And I'm still sitting here
Time goes by and my song doesn't sound like yesterday
I'm rotting way
If I keep thinking like that
If I stop the heart
Because of what I've already given you
Nothing..nothing will be what it once was
Only illusions without knowing
How much longer to understand
That that was yesterday

I tried to translate it as directly as I could but I did have to change some things here and there for it to make sense. Hope it helps!