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I have done my nikah and do not like the person who I married, I need help

i went pakistan some almost over 1 year ago…. and i said yes in marrying my mum’s nephew. i did the nikah, but i don’t like him anymore and don’t know what made me say yes. he tells me how he could have married sum1 else if my dad didnt give him me – this makes me feel bad and i just dont want to be with him.