The most serious breach of trust in Allah’s sight is that a man who has intercourse with his wife, and she with him, spreads her secret.
قَالَ رَسُولُ اللَّهِ ﷺ إِنَّ مِنْ أَعْظَمِ الأَمَانَةِ عِنْدَ اللَّهِ يَوْمَ الْقِيَامَةِ الرَّجُلَ يُفْضِي إِلَى امْرَأَتِهِ وَتُفْضِي إِلَيْهِ ثُمَّ يَنْشُرُ سِرَّهَا