Was he a patient of hers? If not, I would put little faith in the diagnosis.
OH, one thing to consider. When you decide if YOU want to be married to this man (which you have been on the fence about), I believe that you will start acting towards that end. Your actions ot date have followed your feelings.
OH, did he have an affair? I believe we discussed this on FB...but can't recall.
Don't go shaking the [Bleep!] tree and expect an angel to fall out.
Liars lie and cheaters cheat...know it and don't be surprised. Protect yourself.