wasn't garima already married to shashi 14 yrs ago

Was she not already married to shashi 14 yrs ago???
She married him when payal was still very young, khushi was brought to their family later when she was 8... Then why and how can she be the 'woh aurat'??? while still being married she wudn't do something like that... Why wud shashi accept her, why wud he accept her sister's daughter in the family?
From the previous shashi-garima scene it seems garima already told him that it was her mistake and shashi seemed to understand as he nodded... Or he has forgiven her... Or she was never at fault...
Does it not point that there is something else... ??? Or may be the story writer has mismanaged time... well the Answers r with Gul...