Why did my work crush leave the job and never contact me since?

It has been like 9 months or more since i last saw and heard from him and that was at work. At the time he had transfered to a new deoartment so i barely was seeing him at work anyway. So in essence the split was like a slow fade until i just realized i would never see him at work again because it seemed like he had left. We have mutual work buddies. One of them mentiones him a a few months ago so it seems like my crush kept in contact with his bros but not me at all. I guess I really meant nothing to him.

Why did my work crush leave the job and never contact me since?
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