Why does he always stare at me when I do my hair?

I will be in class or somewhere usually at school and I will pull my hair back into a messy bun, re-do a pony tail, plait my hair because I'm bored, put it behind my eat, take out a hair clip or put on back in. I don't do this really thinking and I will look up and if he is in the area he always stares! we usually flirt with each other, there is a whole heap of tension between us but no one ever does anything :P anyways why would he look when I do something with my hair?
Why does he always stare at me when I do my hair?
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