Someone told me that it's half as much time as your relationship lasted, which I can say from personal experience is bullshit. It'll take as long as you need it to. 'Getting over' someone looks different for everyone. I went through one where, same as you, it was bad for a year, and it took me a year and a half to stop thinking about him every day or every other day. I honestly felt like an empty shell for about six months. The weeks blur into months into years and eventually you look back on it and you won't remember what it felt like.

I can't tell you how long it'll take for the pain to go away. What I can tell you is that you need to learn how to fill it with other things. Keep yourself busy. Organise weekly and monthly things with your friends; for me it was a long trail walk every Sunday, a run with my pup every week, and dinner with various groups every week. Go back to school. Volunteer doing something that fulfils you and takes your mind off your own life - maybe help tutor kids or work at a soup kitchen, something. And, importantly, get counselling. Having someone just listen to you and help you work out your own thought processes is hugely beneficial. For me it was like seeing the light at the end of the tunnel.

Do NOT sit on the couch and wallow. STOP checking his social media - stop it stop it stop it. I didn't check for an entire year after we broke up because he used to use it to hurt me. Stop seeing his friends. Delete his number from your phone; if you're not strong enough to do that, and he does message you, have a proxy - that is, a friend who will respond to his messages as themselves via your phone.

Live your life the way you'd live it if you were the one who got away. Sooner or later he'll just become someone you used to know, but you'll be ok, I promise.