Why do guys ignore you after you catch them looking?

why do guys only seem to look at you when you’re not looking but when you look at them they look away and when you continue doing that they completely stop looking at you. I feel like they’re just looking at me because I have something on me but I really don’t do I don't know what is going on. Is this how guys act when they’re interested in a girl?

Why do guys ignore you after you catch them looking?
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