How can I make my ex regret leaving me?

Hey I was dumped and feeling sad and hurt. But I want him to eventually realize he made such a poor decision, how can I do this? I plan to hit the gym hard and just go out and live life make new friends and eventually start to date other men. I was with this man for 9 years. Give me tips please.
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No it is for me so I can be happy and feel better but I just want him to see me one day and be like feel regret
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Because of the way I look
How can I make my ex regret leaving me?
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