Is it a condition for the forgiveness of a sin related to the rights of people that the wronged party forgives it? And if a creditor forgives his debt and then retracts his forgiveness after a period, does his right fall?

We advise you to be kind to your neighbor and to appease him, for if your repentance is sincere, he will soften towards you. As for the girl who retracted her forgiveness, she has no right to do so, as her right was forfeited by her act of forgiving. The money you took from the girls, if it was in exchange for an unlawful عوض (consideration/compensation), then it is not permissible for you, nor should it be returned to them. Instead, it should be spent for the general welfare of Muslims or given to the poor and needy.