why is my husband joining all the same Facebook groups as the woman he cheated on me with?

[Shelly]

My husband had an affair 2 years ago, 10 years into our marriage. It ended when they had a terrible fight (it was to do with me finding out) and she had him thrown in the cells. Even despite this, he still sought her out to talk to her, and ask her "why the hell" she did that to him.

I do not honestly think he ever cheated before this incident and would likely be too scared to cheat again.

I forgave and took him back, but things have never really been the same, even though we never wanted children, I really want to stay with him but just am not sure if he wants the same thing anymore.

They work in the same zipcode and I know he finds it a challenge to stay away from her although he does NOT actively stalk her. But if he sees her, he won't leave, despite my pleas for him to do so (as I cannot be with him 24/7)

Today I found out that he has been adding all the same Facebook groups to his account that SHE has. Yes, it's for kids, but just in itself, what does this mean? He must have at least looked at her page, but why is he copying the stuff she likes? As far as I know, he does not contact her, so is this some kind of way for him to try and reach out to her?