Is he being petty?

My married coworker thought there was a chance with me and made a move - I pulled back and basically I've been carrying on as normal, as if nothing happened. He's been fairly shy and awkward about it, not really speaking to me.

I've approached him and he doesn't want anything to do with me unless it's for work purposes. I've really done my best to build bridges, I've tried to organise to speak to him about it, but he refuses to speak.

Is he just being petty? How do I deal with this? I do really like the guy - he's relatively shy and a big softie so I'm not really sure how to deal with it. And pushing him to speak hasn't helped any - in fact, it's made it worse.
Is he being petty?
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