The roots of trust are built in our childhood, where we learn to receive consistent, predictable care from our parents. Trust is built on order and predictability, which makes it even more psychologically traumatizing when that trust is broken. Studies have shown that psychological traumas (like discovering an affair) can have an effect on brain functioning long after the event has happened.
One of these common changes is the development of hyper-vigilance to prevent further assaults. Being hyper-vigilant is a survivor perspective, it protects us from harm.
These behaviors are commonly acted out by the partner who has been betrayed, by being looking for and being ultra aware of any change in behavior or pattern from their partner. Unfortunately, being hyper-vigilant is non discriminating. This puts us in a position to mistrust everyone around us- other family members, co-workers, spiritual leaders. This is harmful to our social connections- how can we prevent ourselves from mistrusting everyone around us after a betrayal?