Why do boys stare at the girl they rejected?

Qdance890
we have known each other for four years, and were really good friends, he would always tease me and call me pretty, and loved to mess with me, but since i have told him that i liked him, he has stopped and we have drifted apart. he is also really shy..
its been 9 months since i told him that i liked him, and he told me that he only likes me as friends but every single time he sees me he just stares and does not look away sometimes..
--For example i was walking to class and he was on the other side of sidewalk he saw me, he was about to cross the tree, and he backed up, leaned back and stared at me with no expression for three seconds and went on walking to his class. i saw this all from the corner of my eye..
--- if we ever pass by each other he looks at me from the corner of his eye also...
-- so my question is why do guys stare at the girl they rejected?
Why do boys stare at the girl they rejected?
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