Should I try to reach out to a guy I liked at work who just quit?

There was a newer guy I was really attracted to at my job. We didn't talk a lot because we worked in separate areas, but we had a couple really good chats and I was starting to like him. He kinda just up and vanished this week and is no longer on the employee list, but Im able to access his number on the employee app. Its really rare for me to like people, so I was pretty sad about it. Should I shoot him a text? or would that be creepy? I told my other coworker about having a crush on him, and he said Id have a good shot with him. Would it be better if I asked him to text the guy I like and just have him tell the guy I like that Im interested? so it comes off as less creepy?
Should I try to reach out to a guy I liked at work who just quit?
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