Before I decided exactly what kind of two timing scum he is, I'll wait until we find out what his incentive was for coming forward with the whistle blowing. For all I know, he got off on all the stuff going on in the prison and enjoyed taking and looking at the pictures. But then, maybe an offer of money came his way or maybe he was just as involved in the abuses, but given immunity to come forward.
Regardless, anybody who would lie to their spouse would lie to anyone. If you have to take a vow before God, family and friends when you marry someone and then break that vow, what good is your word? And when you hurt the ones you love (wife, son, and girlfriend(!)), you are scum. Beware of the Golden Rule.