One day. Someday. They will be thinking about their life and you will come to their mind. The way you loved them will make them wonder what could’ve been, what would’ve been. They will realize that no one ever made them feel the way you did and that no one would cherish them and fight for them the way you did. Sadly when that time comes, you’ll be with the person who didn’t dare let someone like you walk away like every body else did.
When a problem arises in a relationship.. you can either build a bridge with effective communication, understanding and commitment to get walk over the problem together or you can shut down and build a wall where as nothing gets solved and the problem remains and you don't get through it.