From the one who got away, you have a scar on your heart that was left, never fully to be healed. Do you know how you got it? You left yourself vulnerable. You left yourself vulnerable to love and to be loved, and, now, you're left with the eternal scar of loss.
It keeps you up at night, this scar. You stay up at night wondering how you got it, or, rather, wondering how it got to this point. What happened? What's wrong with you? What did you do wrong? What could you have done better? You can change. You want another chance. You can change. You've changed. You're different now. You're not the same person they broke up with. You're different. Together, you could be different. Together, you could start over. Together you would make it. You would grow old together and sit out on the front porch watching the stars twinkle in the darkness of the night sky. You would choose a star together and say, "That's our star. It shines just for us. That's it. That's the one." And, then, you would cuddle underneath the moonlight and stare at that star, even though you don't even know if you're both looking at the same one, but deep down you just know. And, you know, it doesn't really even matter what star you're looking at, because it's the point of pretending that makes your love stronger anyways. Even if the star you both picked out together burns out, you'll never know, because each night you'll look up at those stars. You'll look up, and, each night, you'll both pick a new star to stare at, or maybe even multiple different stars to stare at, thinking you're staring at the same one, but it won't matter. It won't matter because that's love, ever changing love, and you'd know, because you know that's how love works.
But that's not how this works. That's not how life ever works. Their not coming back. Their not there for you anymore. They left. They left you. They're the one who got away. They will forever be the one who got away. Unlike the falling leaves that come and go with each season, they will never come back for the next spring.