Married neighbor stares at me a lot. What could this mean?

Okay, before anyone jumps down my throat, I have not been involved with this guy at all. Anyway, every time I see him, he stares at me in this really intense way, like I turn around and he's looking straight at me. I have had conversations with him, and he smiles and seems to enjoy what we're talking about, since we have some things in common. He even told me that if I need anything to come by. I went for a walk outside once and saw him out and about and he was staring at me then too, but I pretended not to see him lol. Why would a guy keep staring at a girl this long if he's involved in a relationship? And should I be creeped out?
Married neighbor stares at me a lot. What could this mean?
Post Opinion