Need your thoughts and advice for a friend

I recently got an email from a very good friend whose husband had developed some feelings for another women. I tried to get her to post on here, but she is a bit uncomfortable going on forums so I told her I would post her story to see what you all think. Here is some background and her immediate concerns: Her husband had an inappropriate online relationship with another woman for several months. They became very close and crossed boundaries and eventually sexual innuendos emerged. It was revealed on a group forum that the OW had feelings for the man and he clearly delighted in this. Things escalated in the group forum - teasing of the woman about her affection for the OM and my friend's husband suddenly had a wake-up call and ended the whole affair. He sent the woman an email telling her he could no longer communicate with her ever again and he shut off contact. The OW tried to reach out to him a few times but he ignored her. He responded once to one email about a query she had but was very curt and made it clear he would not continue the conversation. The OW seemingly gave up and there were no more attempts of communication for a few months. After a couple of months my friend's husband started logging back into the instant messenger site that she logs into every day. After a few weeks he stopped. The OW woman tried to reach out to him again a week later in a group email requesting info of friends. He ignored her. Then about a month later the OW visited the man's company website and viewed his bio and picture. He got an email alerting him about this. The next morning he logged back into the Instant Messenger page and he has been on it every day since. Neither of them is reaching out talking to the other but they are both logged in everyday. My friend's husband really has no need to be logged into this IM site everyday as he never uses it so my friend is very suspicious that he is now fishing. She has his passwords and is able to keep tabs on him and so far NC has not been broken, but they are both visible to the other on this IM page Monday through Friday. She has gotten advice from others and this is the advice so far: 1.) It's nothing. It's been almost 6 months and he has ignored her repeatedly and is still not directly reaching out. No worries. Just keep an eye on him. 2.) He is fishing and she needs to put the kibosh on it as this spells trouble. He clearly misses her and things could move quickly if one of them breaks the ice. 3.) He is fishing and she needs to watch him carefully, but not bust him yet as if she does, he might well go underground. Any thoughts or advice on what this sort of behavior means and what she should do about it? Thanks for your help!

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