“You could break my heart in two
But when it heals, it beats for you
I know it's forward, but it's true

I wanna hold you when I'm not supposed to
When I'm lying close to someone else
You're stuck in my head and I can't get you out of it
If I could do it all again
I know I'd go back to you.”

You were young and in love and it got too hard, you left him and you both tried to move on but...