Don't allow someone not worth it to have the power to occupy your thoughts. If they don't find you worth the effort or the time, why should you waste yours?
Why do you think you deserve happily ever after? You were offered it before and tossed it away.
People give up on each other long before they give up on themselves, and they do that, too.
If they don't walk away, we have to walk away, and sometimes we do it crying.