It's not easy, it takes time. Time is your best friend now. Every day pass by you are further away more from her than you were yesterday. Don't listen to music and stay focus on your studies/job and hobbies. Stay with good supporting positive friends and try to do some charity work, like helping around people, it will make you feel good about yourself. Don't rush into a new relation, take your time :) been there and i know how you feel *hugs* you are not alone :)
Trying not to think about someone only makes you think about them more. I have researched it because I get attached too easy to people. The best way to start is by deleting or getting rid of what the two of you had. Sometimes even though you may not be in an intimate relationship, talking it out to a friend helps as well! I always say things are easier when you can say them out loud. whether you're alone or not talk out loud, it helps I promise!
I know it's hard and this isn't what you want to hear, but only time heals a broken heart. Don't call her, don't text her. Out of sight out of mind. It will be difficult but keep your distance. This will pass and you will feel better. Plus get a rebound. That will contribute to the healing. ;)
maybe get back together man or at least still be friends if you miss her it is because you 2 had a close connection and friends have close connections just because you are not dating does not mean you cant be good friends
you can't help but to think about that person specially if it was a long term relationship. just stay busy don't give your brain enough time to think. meet new people and most of all enjoy your freedom everyone have a soul mate this just gives you more time to work on you and your long term goals slowly but for surely you will find yourself not thinking about that person at all remember out of sight out of mind.