Why would my husband join the same Facebook groups as the woman he had an affair with? [after cutting contact]?

[Amber♥]

So it's all over, after 15 months of cheating in 2008/9, and it only ended when I found emails between them.

After I caught them, they still went back and forth for months before he cut her off last summer 2009, and dedicated himself to me.

There was then an injunction on him, put in place by her, Winter 2009; civilly not criminally, I might add - meaning he was never found "guilty" in criminal courts and I think she set him up. BUT they can't have cut contact for this to have happened?

At new year 2010, he met her to tell her he does not hate her BUT that she's wrecked any chance that they "might have ended up together" or at least friends. I know she was devastated. He said he might well have left me for her, otherwise but he "just can't trust" her anymore.

I now see that he's joining the same Facebook groups as her - then he deleted them all except one - and this one was one on which she used to write a lot of comments and do a lot of "likes"....then suddenly a few days ago, they were ALL deleted. He definitely joined those groups recently - and coincidentally, he joined them as soon as her profile was made public by her (it was hidden before) then deleted them just as quickly. I have a feeling she saw him on her fan groups and asked why.

NB she has now set her FB settings to private and cannot be looked for on the search engine, making me feel that she has told him off for joining the same groups as her, he deleted himself, then she set her account to private.

Why is he telling her he doesn't want to know her, then joining her Facebook pages? I do not think he has her phone number. Why cut her off and tell her he's working on our marriage, and then cyber-watch her?