Why would an ex block you, but then be super friendly in person?

My ex blocked me on the social media platforms that we were friends on. I thought that meant that he never wanted anything to do with me again. I was fine with it. He’s in a new relationship and I’m happy for him.

We work together, and now he’s talking to me like we’re best friends. He’ll call me at work to talk for hours. We had to discuss work matters the other day and ended up talking on the phone for close to three hours afterward about non work related stuff. I asked him to take a break today and planned to ask him about it. But he declined.

Why would he be so up and down? Then block me but act fine? Anyone know what might be going on or have gone through something similar?
Why would an ex block you, but then be super friendly in person?
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