No matter how difficult it is, you will forget it. There is no one in the world who cannot be forgotten. It just depends on when you want to forget. When one day, you inadvertently think of such a person, you may think, oh, it turns out we have known each other before. Once upon a time, it was only once, not in your present, let alone in your future. Life will still move towards the future, no matter good or bad, it has nothing to do with the person in the past.