How do I ask a hot-and-cold coworker about his schedule change?

So basically, there's a guy who was interested in me at first. I wasn't. Over time, I was won over by his characteristics and personality. He pulled back for a while. Ever since, it has been hot and cold between us. There are times when things have remained professional and others when it feels flirtatious. It's been exhausting. However, I found out that he might be changing his schedule, and I panicked a little because he is changing the only days I see him at work. I don't know if he doesn't want to see me or something. I don't know how to ask him about it or bring it up especially if he asks why I am asking.

How do I ask a hot-and-cold coworker about his schedule change?
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