I'm scared I'm being stalked

I'm scared I'm being stalked... No one believes me.. I work really close to my daughters school. Actually walking distance. When I get to work I'm the only one there for 2 hours. Lately a car has been drinving by super slow in my work parking lot.. I told my husband about it and he told me that the guy was probably just dropping his kid off in my work parking lot so he didn't have to drive in the drop off line. Anyway, I finally saw his face and I know what he looks like. So he picks up his daughter where i do. We walk to  the school to pick up our kids. So while I'm waiting to walk up there, I notice him stare at me in my car multiple times. Then a few days later he says hello to me in a very nervous way while I'm walking to get my daughter. I have seen his car pass by my house multiple times.. I don't know maybe I'm just being crazy. But last night I had a nightmare that he got into my house. Do y'all think I'm being crazy? I just get a very bad vibe from him