how does human brain change when situations change

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i had a friend she was blind. she hated herself,just because she was blind.she hated everyone except her lover.she always said "if i could see the world i will marry u". a day came when someone donated a pair of eyes,and she cud see everything including her lover.her boyfriend asked her now that u can see the world,will u marry me,she was shocked to know that he was blind too and refused to marry. her boy friend walked away in tears,and later wrote a letter to her saying"just take care of my eyes dear". this is how human brain changes when situations change. from that day on i hated my friend ........am i right in hating her.....iam confused,wat should i do.....shall i continue being her friend or serve my relations with her?