Trust in relationships is a discernment issue because trusting someone requires not only affection or comfort but evaluation of what is actually present against standards that can bear consequence.
Trust is partly affective. It is also evaluative.
To trust well, a person has to evaluate consistency, truthfulness, behavior under pressure, integrity across time, and fit between word and act.
Sometimes a person trusts because they feel safe, needed, wanted, or relieved. Those feelings may matter. They are not the same thing as evidence.
The discernment question is simple: by what standard am I trusting or withholding trust here?
This page gives the Relationships layer a serious criterion page and prevents the whole domain from being reduced to intuition alone.