Personally, I do not expect him to tell you that he DID have a PA.
So, considering DB is solutions based (therapy)... What happened... whatEVER happened... happened...
He knows you are upset. You can simply let him know that it will take a lot of time and effort to not have that thought not hurt so much.
Let him know that, in the mean time you would like to work with him to help you become more comfortable that is not something that would ever happen in the future...
