How to move on?

I'm in a slump after a recent break up. The thing that's killing me the most is how happy he is and how fast he's moved on. It makes me feel like We were nothing and what we had was just merely a phase.

I'm doing fine and holding it up together outside, but inside I feel like a whole part of this world is gone and everyone is just going about life. Nothing means anything to me anymore.

Any help?
How to move on?
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