Regarding Conditional Forgiveness Of Allah Swt
Very true, one has to seek Allah’s forgiveness for every sin regardless But every sin related to people can not be eradicated by asking forgiveness from the concerned individual. It’s particularly true in personal/sensitive matters. I don’t think there’s any clear directive in Quran/sunnah for this. The reason is apparent, human intellect can decide what to do in this matter. If a husband has cheated on his wife and repented then he should ask forgiveness from Allah and be extra kind to his wife. Forgive her mistakes as much as possible and hopefully she’ll forgive him on judgement day