The Five Steps of a Healing From a Teenager-
Step One: The Breakup-
Stay cool. Tears are okay, you're allowed to feel feelings. Just don't lose your temper, it may be just as hard for them as well. If not, a level-minded attitude can come in handy, they may be trying to get a rise out of you.
Step Two: The Reasons-
We all make mistakes, and we must learn from them. They may have lame excuses, dumb reasons, or no sign of wanting to dump you until they did... You just have to think back a bit, think of what you could have done better and what they could have done better. If one outweighs the other, that person might be the cause for the breakup. Just don't be too hard on yourself or analyze too much.
Step Three: Try something you like-
Bury yourself into your hobbies; hang out with friends. Find an activity to distract yourself. (For example, I tried Mixed Martial Arts and loved it)
Step Four: Talk to Someone-
Sharing your feelings can be beneficial. Starting with a clean slate can ease your mind.
Step Five: Develop Your Attitude-
Make a list of how you want to be. From there start making small changes- It could be reminding yourself of your goals, or fixing your posture. A positive mindset can help as well. Remember that you deserve to be seen and heard. As one of my former coaches once said "You are allowed to take up space.".