When I was 20, my girlfriend that I had been with for 3 years broke up with me. It killed me. I felt like a husk of a man. I had no appetite, I was plagued by insomnia, and all I could conceive of was how to get back with my ex girlfriend.
At that point of my life, I had no idea how to get over a breakup. It was hard for me to concede that any thing to do with the breakup had been my fault, and by blaming my ex for the whole thing, I ruined any hope of winning her back.
Take this opportunity to benefit from my mistake. Repairing your relationship with your ex starts with you assuming responsibility for the role you played in the breakup. Buck up and acknowledge where you messed up, and take the steps needed to show your ex that you are worthy of her. If your pride won’t allow for that, getting back with your ex clearly isn’t as important to you as you’re pretending it is.