How do you move on?

My girlfriend broke up with me about three weeks ago, and I'm still pretty down about it, but when I speak to people they just say 'move on', but how do I move on? I have no idea what to do when she's still all that I think about. On a side note, my ex still sees us as really good friends and we talk often, but I don't know if that's making it worse or not.

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