I need some serious help out here..it's about my best friend?

my best friend is in love with a guy (from time immemorial), but she's not sure if he loves her back, he doesn't even show any sign of affection towards her...no special treatment towards hers...treats her like he treats us (all his friend)..she has seen him very closely since he is her older brother's best friend. He's my friend aswell, & so is my friend's. He's like a very serious guy (& he doesn't even hang around with girls...he's a solitary, thoughtful, philosphical person...he's unfriendly..doesn't talk too much..alway very secretive...& a kind of guy who wouldn't be interested in "love"--i think) --somebody with whom you couldn't take chances..i mean i adviced her to just go to him & say the stuff....but she's afraid that if he doesn't like her & say upon her face that he doesn't love her back, her heart would break....& her brother's too immature to understand that his sister is in love with his best friend...i tried to make him understand but he's a nerd when it comes to stuffs like these...so i feel very uneasy seeing my friend's concealed feelings & how she suffers for it. anybody had a similiar experiance? Is there any way the matter can be solved??