I don't know how to get over my ex

Classic scenario, so I'll keep this brief. We were together for two years and broke up at the start of the year. It was mutual, we'd had problems for the last few months. We started talking again a few weeks ago(I initiated it), and now I don't know how to stop talking to her. She said she just wants to cut me out and move on. I understand that but it still hurts. But I don't know how to. I can't get her out of my head. I feel down all the time because of it. She can go out with her friends or bury herself in uni work but I have nothing to occupy my mind. And I can't talk to anyone about it(like she can) so it just feels like it's building up inside me. I don't know what to do.

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