Don't worry, eventually you will give up to think about her....you will wake up one day and boom not thinking about her and not even realizing it....but this may take some time!
I was exactly like you....after the break up...for so long I was thinking about him all the time, the first thing in the morning...and it was like he was with me in my brain and can't get rid of him....and being obsess about his facebook stuff...arggg....he put on facebook that he's in a relationship with the girl that he just started dating....how awful it was?
But finally, I found a solution....I deleted him from my facebook and all his friends off from my facebook....then I deleted his phone number from my cell phone....then I deleted his contact from my gmail to not see him if he's online....all these needed lots of courage....and besides I stop going to the dance class that he goes and I love that class...my teacher called me several times, but I know what is good for me....I can't face him....and I stop going to the places that I know he's there....then whenever he came to my mind, I forced myself to pray and concentrate on my praying words....unbelievable, I managed to reduce thinking about him and now I'm kinda okay....not care about him and not even want to go back....also, I went for couple of dates out with guys....so, now I figured out that there are other people out there....and I'm hopeful
stay strong and you can do it but give yourself some time....

with love
Marjan