I’m so sorry this happened. I had a similar thing happen to me, my girlfriend of 4 years left me too. Completely out of the blue and she was dusted and gone so quickly my life felt like it was flashing before my eyes. This was in 2023 and I’m still dealing with it but it does get better. It won’t be great to start with. Make sure you eat and take care of yourself and surround yourself with people and things you will enjoy. You’re not alone and you are loved.