recently my bank refused me mortgage due to low credit score.?

but i paid all bills promptly,never had single late payment.now how can i get my credit score repaired? or how it become poor. i had a joined account with my partner and partner made few payment problems. now am legaly divorced. is my partners payment problems affect me or not?how can i buy a house?.please advice me.we closed our joined account also.but my partner still owe money to banks.i paid half of my partners debt(ie. eg. partner took £3000 loan but i paid £1500 , because it was a joined account.the loan was taken without my knowledge)

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