i dont know how to forget

i 17F was online dating 19M for almost 9 months but my parents broke us up (for a bunch of reasons) i can't stop thinking about him and all the sweet things he did i really loved him, he was the only person who i could be myself with but i know we won't ever see each other or talk again (things didn't end verry calmly) there was also a lot of miscommunication. but i can't forget how much i loved him, and i wish things ended differently and i wish i could redo everything. how do i move on and forget about everything?