How do we build trust? I believe it is mostly about believing that a person's motives are true to our shared goals. It does not matter if it is a personal relationship or a professional relationship. Do we both have a shared vision for a final outcome?
The depth of our trust is based in how well we understand our shared vision for a specific outcome. Our understanding only comes with open communication.
Broken communication will nearly always result in a break in trust. We do not know the person's vision or motives. We wind up filling the gaps - deciding what their motives are or what their vision is without hearing it directly from them.
We will be wrong at LEAST 50% of the time.