I highly suggest being blunt about it, and either asking him if he's into you too, or simply asking him out yourself. Guys like when girls show confidence, and there's no better way to show you're confident than walking up to a guy and asking him out!
Or, you can go the other route and be shy about it, possibly doing nothing to show him you're interested in him. Sometimes, people who use this method drop subtle hints such as smiling [which is common in girls and doesn't always show you're into a guy] or having a friend ask if he's into you [this only shows that you're too shy to do it yourself]. This option is really kind of stupid, and is used all too much...
As I always say:
Life is WAY too short to not take chances and risks once in a while. Why sit around wondering what could've been, what would've been and what should've been, when you can answer all of those questions and then some by being honest and telling a boy how you really feel about him?
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