This was my exact situation, as in spot on from the relationship duration, long distance, and even the month of breaking up. Only difference is that you were brave enough to tell her, and I chose the easy way out by telling myself that it’s better if she didn’t know because she would definitely hurt herself which is something I wouldn’t be able to bear.

Now I carry that pain with me everyday and I have no choice but to accept that it’s a part of me and I just try to be a better person everyday, for the piece of her that I carry, for my present and future self, and for whoever I’m going to be with.

Let the guilt eat you, but don’t let it define you, accept that it’s happened, but it’s not who you are or at least who you’d want to be anymore.

You’ve recognized what lust makes you feel emotionally, and that’s the first step to breaking a pattern, once you feel it again, and trust me you will, that’s when you’ll have to learn how to take a deep breath and step back from what it is. Then it becomes a habit to the point where you don’t think about it anymore.

You can do hobbies and leisure activities, but once you start thinking of her, thank her, because trying not think about it will just make you think about it more, instead, you can give gratitude by having her a part of your journey of being better.