Trust has many components:

-Competence - are they capable?
-Self-discipline - will they do it?
-Honour - do they betray oaths for incentives?
-Intellect - can they see the order effects?
-Virtue - do they have good intentions?
-Honesty - do they hide important information?

Naturally, the more boxes that are ticked, the most trustworthy a person is, because reliability is a sub-facet of trustworthiness - which leads to some counterintuitive combinations.

For example, an honest virtuous person may be untrustworthy because they lack self-discipline.

Trustworthiness is ultimately "will they keep their word"

In this case, the virtuous honest person inadvertently lies and doesn't deliver on their word, not due to bad intentions, but owing to a lack of self-discipline. Poor self-control makes a liar of even the most honest man.

There is far more to evaluating the trustworthiness of an individual than simply ascertaining their intentions, you must likewise evaluate competence and reliability too.

Only when all these things are in alignment have you minimised your risk of disappointment and betrayal.