How to learn to move on?

It always takes me forever to move on from someone, I keep doing things that interests me and I think I'm quite an all rounded person, but the heartache whenever I think about him makes me so broken whenever I'm alone. I'm happy to do fun things but just don't want to see anyone else yet.

Any advice on how I could move on? I genuinely don't feel like dating anyone else and I feel like I do have a life, friends and hobbies.
How to learn to move on?
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