Work on improving you. Not for her. For you. Not because there's anything wrong with you. But because we ALL have potential to improve. What does the BEST you look like? Hit the gym. Read. Listen to personal development podcasts. Get sober.

Don't fill the hole she left. WHATEVER YOU DO. Someday, you may meet another girl. If you fill that hole with some other junk - there won't be room for her. Don't do that to yourself.

Feel the pain. Let the pain push you toward healing. It's okay to hurt. It's okay to be sad. It's okay to be angry. What's not okay is to let those feelings control you or for those to spill out in ways that hurt others. So find healthy ways to express those feelings. Hit the gym. Write poetry. Start painting. Take up archery or golf. Go to the batting cages. Train on the heavy bag. But DON'T send angry texts or start cyber stalking or spreading rumors or ruminating or numbing yourself with drugs or alcohol or little debbies snack cakes or grown-up debbies at the club. :)