glassofred - that's the point.
He's so unaware that he's making you feel even worse, when it's your joint so by definition HIS choice as a family for you to be a SAHM. So it's not like you just upped and told him one day you weren't going back to work and then just lazed around the house or something. I mean does he expect you to doll yourself up during the day when in all likelihood (can't remember DC ages) one of the DC will throw up on you or spill food on you, or whatever?
Can you say/have you said something like this to him?
You seriously sound just like me, only I didn't cotton on, and his thing progressed from supposedly just chatting on the phone, to chatting in office when he went to her location for work, to meeting for after work dinners when he/she was in town, to going off on one or two day extensions from overseas business meetings, to finally a 2 week overseas vacation around a 2 day business meeting they were both on. exact same excuses, exact same BS. That's where it sounds like this was leading.
Also let's be clear here. It is NOT your fault in any way. It is his. I started off feeling like I'd done something wrong in our marriageto cause it and even had a couple counsellors hint at/say this. I felt that way until I read some other books by well known authors (think John Gottman etc), that unequivocally stated it is the person who betrayed who is in the wrong.
Noone's marriage is perfect. He made the choice to meet this woman, made the choice to not tell you, he made the choice to continue seeing her and not tell you, and at any time HE could have stopped it by just saying no, i shouldn't do this. It's got nothing to do with how you look or what you do for work, it's about him making the wrong decision and now try and backtrack and tell you that it shouldn't matter that much to you.
Has he given you an explanation for deleting the messages all of a sudden?