No it's just the opposite.
You were better than she was and your husband knew it too.
His behavior would only be accepted by someone equally broken and damaged. He had to seek out someone lesser than you in order to find justification and validation for his actions and words. A healthy, strong, and intelligent person wouldn't accept such behavior.
There is a thread in JFO titled
They Always Affair Down
It's a must read.
People don't have affairs with healthy, strong, intelligent, and secure people. He had to go trolling for someone lesser than you. In fact, in many ways she needed to be lesser than he was too, so she'd validate him and make him feel important and smart.
She was never better than you. What she was to him, was better at accepting his broken mindset and messed up actions without question. She fit his need to not be held accountable or responsible for his behavior. So the only thing she was better at was being a hot mess.
TT for 6 months
Unremorseful for 3.5 years
Delay is the deadliest form of denial. - C. Northcote Parkinson
Your standards aren't up for negotiation just because he/she can't meet them.