The Prophet ﷺ said: When a man tells something and then departs, it is a trust.  

قَالَ رَسُولُ اللَّهِ ﷺ إِذَا حَدَّثَ الرَّجُلُ بِالْحَدِيثِ ثُمَّ الْتَفَتَ فَهِيَ أَمَانَةٌ  

The Prophet ﷺ said: Meetings are confidential except three: those for the purpose of shedding blood unlawfully, or committing fornication, or acquiring property unjustly.  

قَالَ رَسُولُ اللَّهِ ﷺ الْمَجَالِسُ بِالأَمَانَةِ إِلاَّ ثَلاَثَةَ مَجَالِسَ سَفْكُ دَمٍ حَرَامٍ أَوْ فَرْجٌ حَرَامٌ أَوِ اقْتِطَاعُ مَالٍ بِغَيْرِ حَقٍّ  

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