One day, he will come back, he will tell you stories of how his life changed since the day you left, he will be sorry for all those mistakes that he did in the past, he will tell you how karma hit him back and how he wants you in his life again.
But you won't.
Because you will tell him stories of your success, how you've finally forgotten his mistakes and moved on, you will tell him about the one who loves you the right way and how you don't want him to come Back.
Think about that day, and live for it, that day will make up to everything that he'd ever done to hurt you, every tear you'd shed for him and everything you'd lost because of him.
Work for that ONE DAY! you deserve it!