Will the failure of some women, with whom the questioner committed adultery, to forgive him after his sincere repentance, due to his rejection of their conditions (marriage or a sum of money), be considered an injustice for which he will be held accountable on the Day of Resurrection?

You owe nothing to these women with whom you committed fornication, because a consenting fornicatress deserves nothing, as mentioned by Ibn Al-Qayyim and others. Therefore, you are not obligated to marry the one who requested marriage, nor to pay money to the one who requested it. However, if you enticed them into fornication, then this is a sin from which you must repent, increase good deeds, and completely sever your relationship with them for fear of falling into sin again.