dating a friend? help

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I've had a friend for 3 yrs and he's passed the signals that he'd like to get to know me better. problem?? I'm passive-aggressive, I'm a leo, born in the year of the dog, the eldest child, selfish etc and he is pretty much the opposite including shy, what do I do? do I need to "slim" down on the attitude or does he need to step up? we've already established that we like each other, but he's still shy about what he wants