I could see maybe that they were facing the holidays and had no desire to try and 'go through the motions' for so many family-oriented things. That makes sense if THEY bombed YOU in November.
However in my case, I busted him red-handed. I don't know how much longer he would have avoided a confrontation and continued to deny and gaslight had I not caught him.
I do know that after I caught him and we were 'trying to fix things'...I found a text from him to her saying he was just trying to get through Christmas with the kids and then it would be over and they could be together...only he drug his feet another 18 months after that...with my help.