My ex boyfriend started to be hot&cold after we met for the first time after the breakup?

We met once after we broke up because I was nearby where he lives, everything went well and we had really good/friendly conversation, except at the beginning he was so nervous and a bit awkward.
But after we met he started to be hot and cold... What's going on?
Is that because he found that he still has feelings?
What should I do?
Updates:
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We live on the opposite side of the earth that's why we met when I was near to him.
We were really good friends before started dating, and that's why we wanted the friendship again.
Just wanna know his feelings so I know what I should do.
We don't wanna get back together because distance was too difficult for us.
My ex boyfriend started to be hot&cold after we met for the first time after the breakup?
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