I can't really say with any certainty, but keeping your mind busy with new things, and allowing her free reign in your memories.
I know that second sounds counter-intuitive, but the harder you try to forget, the more impossible it will be. You know this to be true. Like trying to get "that damn song" out of your head, when it just keeps repeating. If you don't try to stop thinking about her, the thoughts will continue, but become less frequent and less hurtful, and one day, you'll,wake up, and remember and you'll realize it's been a few days since you last had a thought of her.
It isn't something you can do...it's something that happens when you stop trying to do it.
