is a small crust more bigger than 5 year love.......?

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its a story of a guy who love a girl from the school time,at that time he was in class 12th and her lover was in class 11th. they both love each other.they spent as much as possible time with each other.but after schooling its difficult for boy to meet her.so he join her tution batch ,so that they both meet.they spent 5 years with each other and the mean time boy started working.in his office he crust on a another girl.boy told his girlfrnd that their is a girl in his office,and he was having crust on her.and his girlfriend starts fighting with him,she blame him that he was in love with that girl, .but the boy love his girl friend very much, he told her that its only a crust ,he didnt like the office girl.his girlfrnd stop talking and meeting to him, after that they brokeup.i want to ask that whos fault in this brokeup.......??