Try to focus on the negative qualities about her. Also stick to NC. It really helps. Block her on facebook. Make it impossible to see her face. Delete her number so during moments of weakness you cannot contact her. If you work, engross yourself in it. If you study focus intensely on that. Take time with getting to meet other people. You need time to grieve when and you're ready to go out and join clubs for example, you'll know. Try to think about something you have always wanted to do for yourself. And do it. For me, focusing on the negative qualities and no contact really helped.
"The loudest one in the room is the weakest one in the room."
"Teaching should be such that what is offered is perceived as a valuable gift and not as a hard duty."