Is this behavior by my male employer normal?

My boss seems like a nice person, especially at first. But as time goes on, I notice that he stares at me from afar and wanders around until he is in my vicinity, where I am working. At first, I wondered if I was doing something g wrong, but I am not sure. The. He would disappear in the bathroom, etc, for a long time until other employees started asking for him. Whenever I am around, he will get on his cell phone and walk around or go outside to talk for a long while. Now, he seems to try to avoid me and acts restless when I am around. I noticed recently that he is barely scheduling me for work. Do you think I may have caused a problem with him without knowing? I get along with all the other employees, and they always ask about me when I don't work.
Is this behavior by my male employer normal?
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