There are three characteristics of a hypocrite: when he spoke he told a lie, when he made promise he acted treacherously, and when he was trusted he betrayed.

قَالَ رَسُولُ اللَّهِ ﷺ مِنْ عَلاَمَاتِ الْمُنَافِقِ ثَلاَثَةٌ إِذَا حَدَّثَ كَذَبَ وَإِذَا وَعَدَ أَخْلَفَ وَإِذَا ائْتُمِنَ خَانَ