He blocked me on WhatsApp but not Facebook?

It's a guy I work with, we had been flirting, he made a move and the circumstances weren't right so I said we should keep it professional. We chatted a bit on WhatsApp about what happened and then he blocked me!! He didn't block me on Facebook though, but he did decide to just ignore my comments and didn't respond to me.

He's since unblocked me on WhatsApp and started being friendly towards me again. We work for the same organisation but in different locations so don't see each often, but it just so happens we're seeing each other this week for a team conference.

I'm a bit confused by it all. Is he still interested? What's blocking me on WhatsApp just a power play of some kind?
He blocked me on WhatsApp but not Facebook?
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