Detaching is a process. I can't imagine how hard it is having to go back and see her on a regular basis.
I am not the expert on how to handle kids since I don't have any. I would think that spending lots of times with the kids would be good. You need to be the best you and the best father that you can be. But, do you not have a visitation plan? Can you not take the kids to your place? or at least out of the family house?
W 34 Me 42 Married 7 years together 8 0 kids 1 beloved dog BD 4/6/2018 I moved out 4/7/2018 I moved back in alone 8/05/2018 I file 3/06/2019 D official 5/7/2019