Trust is the lifeblood of relationships. This is obvious in personal relationships but there are many types of relationships. When you pass someone on a two way road, there is trust that each will stay in their lane. Without trust in the other then there can be great damage and hurt. Again, I say, trust is the lifeblood of relationships.
We know when we don't trust another person. You can try to put it into words and sometimes you can articulate why you don't trust someone. Maybe they wronged you in some way and broke trust. Maybe they just look like someone you don't trust (this is sometimes the implicit bias that leads to misjudgments and prejudice). But for many of us, we know when we don't trust another person.
The question is how do we know someone does not trust you? We can all put on a nice face and be pleasant with one another, so it is easy to miss that someone does not trust you. However, here is one way to discover someone does not trust you: The other person does not give the most generous interpretation of your actions.
If you find yourself in a conversation and the other person is not giving you the most generous interpretation of your actions and words, then maybe the conversation needs to stop being about the issue but pivot to trust. Talk about how to rebuild trust between yourselves. The conversation about trust is paramount because even if you resolve the specific issue, unless trust is present, there will be another issue in the near future.
The "thing" is rarely the "thing". More often there is a "Thing" behind the "thing." Many of the conflicts in the world come from a trust vacuum. Broken relationships, broken churches, broken nations and broken systems result a hemoraging of the lifebloood of trust.