Tricky, if its not possible to move away from the area or work and you don't want to loose your friends. The only thing I can say is just be strong and stick to your decision. If in your heart you are sure you really want nothing more to do with him and you know you've done the right thing, then you can and will eventually move on and start to heal, it will just take time. As I said before I suggest you maybe try other things in your life, than you did with him, go different places and broaden your horizons, make more friends. It may help in making you feel you are moving on, have grown away from him and are looking forward to what the future will bring. Good Luck