Look dude, if there's one thing I've learned about dating, it's that you need to move on. You'll be happier. Your life will be easier. Everything will be better. Trust me. It's natural for you to obsess a little bit over a woman, it's just your brain. It's human. Once you move on you'll realize how fucking ridiculous you were being before. I've felt it too, it's hard. But you need to push through it and move on and be happy.
