Eye contact,i dont know if its me looking at him,or him looking at me,but he is avoiding me.why?

I'll be walking along and this guy i know is there when i look up.It feels like everytime i look up we catch eyes.Not even deliberate and its making me uncomfortable.Im not sure if its me or if its him,but its getting awkward between us. How do i stop it from getting overly uncomfortable???I feel like i am going crazy..