After reading your convo with your husband I have this feeling that he is on the edge of a cliff as far as his decision making is going. I mean...that convo you had with him sounds like something I have had several times with my husband. Don't be surprised if today he acts all happy again like nothing is bothering him (he is only psyching himself out). One thing that my husband has said recently is that he had to try and convince himself that the decisions he was making were the right ones because he didn't know how to come back from all the lies and games he had played. Your husband isn't manipulative like mine I don't believe so in my opinion I think he truly doesn't know how to come back from the hurt that he knows he caused to you and so many other people.
IT is VERY hard to come back...your husband not only hurt you but his own family knows. He has also intruded on someone else's marriage. It can't be easy for these WS to have to face all the damage. For example, me and husband are attempting to work on things but he is not allowed to come to my parent's house because my dad will not welcome him here. My husband has to deal with this because that is another relationship that he broke in the process of all his lies and deceit. My husband's mom is also hurt by the level of manipulation that he put on me, her, and the OW who has his child. He has to deal with all this.
Your husband is on the edge and just doesn't know if he can deal with it all yet. Continue what you are doing. Be a little distant.
Oh and on that fb message, I know it is hard but don't respond to text messages like that. He is only baiting you and you shouldn't have to defend a status message that you put up on your private page. That is the LEAST of your husband's concerns...he is the one that IS having or WAS having an affair. Your status message is nothing but something for him to try and hang over your head or another justification for him to use regarding his string of bad decisions.
Sorry for the long post...hope it made sense.
Me: 28 H: 32 1st marriage 4 both 1 1/2 year married 2gether for 9 1S: 6months 1stepson: 2yo