Career

Direct all this anger and desire for vengeance into a more worthwhile venture like recruiting/networking, college (if you're a student), or even exercising

Bet revenge is to just move on and do better. Definitely dodge a bullet, she did you a favor. Move on and forget it

What makes her so special and why do you want her back? She ain’t worth it

Writing out the most sinister, vindictive, cruel, and vengeful plan on a piece of paper. Maybe twisting on her insecurities, degrading her character, since you know her personally I will let you devise your master plan to fuck her life beyond recovery. You need an outlet to release anger. 

Once writing out everything, go burn that piece of paper. Suck it up and repress your emotion is not a good way to cope.

Agree with the above. If this isn't a troll, then go be angry with your friends or whatever and drink or talk to someone - whatever can help you get over the initial wave of rage. After that, forget about said shawty lol. Clearly she isn't aiming high if she left you for a vape dealer (is that even a thing?). Just be a beast and continue accomplishing what you want. You'll forget about her in due course.

Bang her mom

The best revenge is living well.