How to keep a guy I rejected interested?

There was this guy i liked for a long time. We kissed few times. But then i rejected him cuz i met someone else. But i want him to still like me. I would say he is losing interest a little cos for a long time after rejection he was teasing me or making fun of me playfully and just talking to me and stuff. Now i gotta say hi first and mostly initiate every conversation.

How to keep a guy I rejected interested?
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