Why would a guy ignore me for 2 years after he was the one who didn't want to date and now acknowledges me by saying hi when we walk by?

Background: He ended things because he wasn't over things. He approached me the day after and said we can be friends. Then completely ignored me. So now all of a sudden he has been looking my way and actually saying hi to me. It's been 2 years. I just don't get it. We work in the same building and that is how we sometimes run into each other.
Why would a guy ignore me for 2 years after he was the one who didn't want to date and now acknowledges me by saying hi when we walk by?
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