You can spend years waiting for somebody to regret losing you and accidentally keep yourself emotionally waiting too.

Waiting for someone to feel the loss keeps you in the relationship after it has ended. Every month spent hoping they will realize is a month organized around them, and it happens quietly, without any contact, entirely inside your own head. Even if the regret eventually arrives, you will have spent the intervening years in a waiting room.

Notice if you are still keeping the ledger open. Ask what you would do differently today if you knew for certain they would never regret it. Then do that. The recognition you are waiting for is not owed and not coming on any schedule you can influence.