The way Jones behaved it is almost like an abusive relationship I think. He married Linda when they were both very young, he was all she knew and like with any abusive relationship there were probably many happy moments among all the torment (his affairs). Those small happy moments would have kept her locked into their relationship, always hoping for that version of her husband to come back to her, like when an abuser tells their partner they are sorry for hitting them, they love them and will never do it again, until they do it again.
I know one thing for sure with his type, if SHE had cheated he would have walked away from the marriage and not have stood for that disrespect. That type would never take what they so eagerly dish out to others. I think expecting her to walk away after he cheated would be like telling her not to breathe air, she couldn't expect to survive, he would have her convinced that she couldn't survive without him. An excellent article is available online called "repeated infidelity is a form of domestic abuse" it outlines how this dynamic works and the physical, mental and emotional harm it causes the faithful partner, a really good read.