I am sorry for your pain.
I feel it's a huge assumption to think/say that everyone entangled in an affair is a "sleaze." People are very complex and some of the most ethical, most loving and compassionate people I know have been challenged with decisions around extramarital affairs -- and for many different reasons.
I vote for bypassing the judgment and moving forward with healing.
Please consider all you have learned in therapy, as to why you were vulnerable to an "unavailable man," so you don't need to repeat this pattern. It's in the past now.
This was, undoubtedly, a hurtful experience for everyone -- you, his wife, him, etc. Everyone deserves compassion.
You can choose to move forward with your healing -- and with your life.

WC