Back stabbing friend

My friend Bob has been stabbed in the back by another so called friend. This guy (I will call him Phil) had an affair with Bob's wife for years all the while professing his friendship to Bob, they went on holidays together skiing, sailing etc. Phil is well known for his inappropriate behavior towards women and lewd suggestions, he is well known to fool around, he has had women at his workplace for sex, he has even had a relationship with an employee at his work, a serial offender. When Bob discovered what Phil had been up to he was completely shattered. Phil is a sexual predator who groomed Bob's wife a lot like a pedophile would a child. He lured her into this affair by manipulating her over quite some time. Once he had succeeded he further manipulated her by telling her this was their secret and they had to keep it quiet. Now I know it takes two to tango, but let me say this woman would never have sought out an extra marital relationship on her own, she is just not like that. I know Phil would have been the instigator, he has on many occasions made suggestions to other guys wives, to my wife. Most shrug it off as a joke, some feel he is plain creepy. The strange thing is Phil is married to a wonderful woman, she is cute, has a great personality and is a loving soul, everyone likes her. Yet he seems to have this sexual urge that has to be fed by whatever means. Phil's wife now knows of this affair, Phil has spun her some great lie about it only being for a few weeks and he is the innocent party of course, if only she knew the truth about his "obsessive compulsions". She really does deserve better than this creep who obviously does not care about her feelings or what a wonderful lady she is. so I guess my question is, should Bob tell her the truth about Phil? should I tell her the truth about Phil? Or should we let her go on being deluded by Phil? I know she would be really hurt to find out about who she is married to but she would be better off in the long run. Bob and I have talked about this but we are reluctant to bring this all out in the open because we both think the world of her as a kind caring person. What should we do?

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