One lie

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A gal and a guy were really close friends since the childhood years. They matured together, they did a great deal of things togetehr and ofcourse soon they fell in love. Seems like a romance till the end? Oh no, not in this instance! In our story this idillic image was wrecked into pieces in just eventually by just one action. Who made the blunder? is there a means to fix it? Our heroes will have to walk a long path before they can address these inquiries.