Why did he look down so awkwardly?

I had coffee with my ex (just as friends) back in November of last year, where he tried coming onto me. I turned him down because I was already seeing someone else by then, and left immediately. He got a new girlfriend about 2 weeks after that. The other day I was walking into a coffee shop with the guy I'm dating and we saw a mutual friend sitting at a table with two other people (their backs were turned), and when we approached to say hi to the friend, realized the other two people were my ex and his new girlfriend. My ex looks extremely surprised, mutters a "hi", and then spends the rest of the time looking down at the table, and avoiding eye contact before suddenly declaring they had to leave. Why did he have to act that awkward? I thought it was really douchey to pretend he didn't even know me.
Why did he look down so awkwardly?
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