Betrayal of trusts is one of the signs of hypocrisy.

It was narrated from ‘Abdullah ibn ‘Amr that the Prophet (blessings and peace of Allah be upon him) said: “There are four characteristics, whoever has them all is a pure hypocrite, and whoever has one of them has one of the characteristics of hypocrisy, until he gives it up: when he makes a covenant he betrays it, when he speaks he lies, when he makes a promise he breaks it, and when he disputes he resorts to obscene speech.”

Narrated by al-Bukhaari (34) and Muslim (58).
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