Hi.. I'm sure when you both were in love it felt special to both of you.. Also because of the age you were too young. But honey, as we grow our feelings and emotions won't stay the same. From what I get, you are still at the place where he left and he moved ahead and why not..
Next Steps
Accepting the fact that things have changed for you might be different but you defiantly need counselling to explore your underlying emotions..
Health Tips
Pay attention to your feeling and analysis if you want to continued to be chased or want to win the game.. Stay strong and start loving yourself first.. I hope you feel better soon...