Do Your Trust Issues Stem From Within?
Did one of your parents have an affair?
I know it’s cliché, but clichés exist for a reason: if one or both of your parents had an affair, that likely caused some trust issues in you. If, objectively, nobody believes your partner has done anything to cause you not to trust him, and you come from unfaithful parents, your childhood may be at the root of your mistrust.