Boyfriends remembering birthdays -- why is it so important?

What does it mean to you if your boyfriend remembers your birthday? What meaning do you derive out of it?
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A summary to save time for those who would like to respond. "If my boyfriend remembers my birthday, he thinks I am important. If he doesn't, the opposite". This is assuming your boyfriend thinks with your brain, which obviously is not the case.
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A clarification for those who somehow got the impression that I am against celebrating birthdays --- I celebrate my girlfriend's birthday with her every year, for years. I am asking this question to learn WHY girls think what they think.
Boyfriends remembering birthdays -- why is it so important?
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