Flat out stares at you, when they get caught they look away: Gemini, Cancer, Virgo, Capricorn, Pisces
Stares at you even whilst you're shaking your head like "What the heck is wrong with you?!": Aries, Libra, Sagittarius, Aquarius
Will always be looking at you but you will never know: Taurus, Leo, Scorpio