This coworker I feel like is giving me mixed signals?

One day it feels like he wants to converse and talk the next day it’s like I’m totally ignored, usually he is good at greeting me almost every morning but with talking it’s like he has his moments or feels like some times he don’t even notice me, I like when people are the same pretty much all the time ( now I know there are days when you have a bad day or what not) but if it’s something like I’ve described than how can I deal with a person like that what do you think I should do and how I should react this this situation should I completely ignore him unless he greets me and just move on with my life or what?

This coworker I feel like is giving me mixed signals?
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