problems with love

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I want your opinion, I love a girl, but we are best friends. 4 years ago we were together, but we break up after 3 months. we stop talking for a year, after that we start rebuilding what we have without notice. the problem now is that she is in love for another guy, they date for a wile and he broke up, now she continue in love with him, but he doesn't. and she suffers from that, and guest what? yes she come talk to me about that. and yes she knows I love her. what should i do?