What does it mean?

I contacted my ex after 2 months from the break up and 4 weeks of no contact. I was very cold and distant because I asked him if we could meet to exchange our stuff. His responses were surprisingly very friendly, telling me how he was and what he has been up to, lots of emojis and very nice, maybe too nice. When we still were talking, he was the one being cold and distant (he's the one who broke up). He agreed on meeting up and told me he would be on the look to find my things. I don't understand this change of attitude, I'm not used to it. What does it mean?
What does it mean?
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