Ok, so she read that email with the video and is still calling/emailing you and being "warm". She is coming to YOU, too. Hmmmmm...sounds good to me. I can understand how the deer thing got to you. Understandable. But, something got to her, too. You are fighting. Don't stop. She also made the comment that she doesn't like being all alone at home....hmmmm...missing the kids, you, family, etc.? Yep.
Is she having her life with OM when not with the kids? Maybe. But, she is still getting you and the kids pretty easily along with it. What happens when you pull back and the OM doesn't do those nice things you do for her, when she has to pick up the kids herself and see them in their warm, cozy,happy home with you... And, SHE has to take them away to her apt? That won't feel so good for her.
I don't like that she made the comment about how you still will do family things (Thanksgiving) even though separated. I remember my one friend saying that same thing, seeing no reason that she couldn't have that. Cake eating big time. Her choice has consequences.
Have you continued to go to church with the kids? I hope so. These things that you "have to do" and these get togethers you are planning...they aren't with abc or d are they?
Everyone understands the loneliness. The thought of her not feeling it (you think) makes you angry. Go to God. Keep away from the parasites...messenger is one of them.