Lilac
Our situation was very similar. Dday was in October. Thanksgiving, with all the kids and one grandchild sitting around the table, WH goes on and on about how thankful he is for his wife being the heart of the family for the past year and I'm trying not to throw my turkey leg at him. I felt like I was forced to keep his secret.
In December, my third daughter and I went to visit my second oldest daughter in another state, and again, I had to keep a happy face on while they, along with my grand daughter, were delighting in the Holiday and talking lovingly about their father.
The day after I got back from that trip WH informed me that he had spoken to OW (we had agreed we would do it together when I came back, she got pregnant so we couldn't NC). I was livid and he didn't understand why I was reacting that way. Both daughters drove back to our home, along with my grand daughter, and on my way home from work the next day, WH sent me a picture of my grand daughter to announce they had arrived.
That is the first time I had a complete and total meltdown. I had a full blown panic attack. I had never felt anything like that in my entire life. I couldn't breath, my chest hurt and I just knew there was no way I could go home and face my children and act like there was nothing wrong any longer! I had to pull over because of the attack, but also because I didn't want to go home. This was something else he took away from me, the love of being around my children and grandchildren! It was too much.
I called him and he came out to get me. We talked for a long while and he finally understood how distressing him still talking to OW so easily, without me there, it was for me, plus the fact that I had to continue to lie to my children. Of course they knew something was wrong.
Once I calmed down, he told me to make my way home slowly, stop at a store, or get gas, anything to give him time to sit the kids down and tell them. He didn't want me there because he said that this was his failure and his alone and he needed to face them on his own.
When I arrived home, they were all outside waiting for me to give me hugs. I've always had a very close relationship with my kids and have always tried to be as open and honest as I could be. At the time WH disclosed the information to them they were 27, 26, 21, 15, and 14. The youngest two are my sons, the oldest three my daughters, two of whom are married and have a child of their own.
The relief was tremendous! I no longer had to carry his secret with me into the house every day. I dreaded coming home because I knew I would have to act like everything was normal while I was dying inside. They told me later that this was not even on the list of things they thought it could be. They thought it was a health related issue that we didn't want to discuss with them. I had a scare in 2016 that almost killed me (infection on my ovaries) and they were afraid it had come back.
I took strength from them but honestly, it was just the relief of not having to carry that burden around anymore the helped the most.
This was longer than intended but take what you will from it. For me it needed to happen, it was causing me physical harm and while the kids have a new view of their father, it doesn't negate the fact that he is a good one and always has been to them. WH has told me that telling me and then telling the kids were two of the most difficult things he's ever had to do, that he could see their disappointment and loss of respect in their eyes.