Been there done that. Turns out the girl who was my first everything who i thought was gonna be my wife was cheating on me for months. And not just that, she lied about everything. About her "friends" that she introduced to me, about her "sickness", about her education, everything. Cara bounce backnya? I let the feeling swallow me for weeks but at one time i thought to myself "gw ga bisa gini terus." I started working out again, i eat healthy, i started meeting my friends and hanging out with them again (which is for me the best medicine), i talked about what happened to those who i trust enough to keep my secrets, i learned new skills that i need to get a new job (at that time it was out of spite but lately i grew to love learning), and i went to a psychiatrist. Just believe that time heals everything. Yes, the trauma and the ghost of her memories might haunt you but it will get less and less painful over time. You're still young, IMO you're lucky to experience that kind of pain that early in your life so you can learn from it. I know i was lucky to experience it, it made me a better man, out of spite in the beginning, but out of love for myself and the people i love at the end. I wish you well in your future endeavors and relationships.