Would he repeatedly stare at her, up and down, when he is not interested in her?

He stares from afar. Doesn't stop staring whenever he sees her, just stares with eyes and mouth wide open and eyebrows up.
Sometimes just stares, without showing emotion..

He does that when he is single and when he is in a relationship.

Even when he passes by with his car, on the street or just watch in the gym, and just stares at her..

Is he then still not interested in her?
Is she just a crush to him?
Would he repeatedly stare at her, up and down, when he is not interested in her?
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