Does paying off my share of the loan in cash, while my partner's share remains in installments, expiate the sin I committed?

It appears that the loan was usurious, which is a grave sin for which Allah has threatened its perpetrators with loss and war. The loss that occurred was due to the ill omen of this disobedience. One must get rid of the usurious loan by repaying only the principal, without the interest, unless compelled otherwise, for Allah Almighty says: ﴿And if you repent, then you shall have your principal; [thus] you do not wrong, nor are you wronged.﴾ One must hasten to repay the full amount at once if possible, or in installments if that is not possible.