Is this the end of my marriage?

[P17]

I have been spending most of today thinking what I need to do, how to do it and reading DR, online, forums etc.

It is time for me to look into how I implement LRT / NC with my W. It is the only way I am going to be able to completely detach and focus on myself. My good days / weeks have been great because there has been no contact. My bad days usually focus around when she is either due to be here or she has just left.

I'm really not sure how to go about it - I gave my word to keep contact between my D and my wife so I feel like I have to justify why I'm removing it. I think going NC will actually suit my wife - she;s already told my D that no matter what she will always love her so she suspects this is going to happen but has already talked about plans with D in December (school concert, xmas presents).

I was thinking of saying to her that while there is a third person in our marriage (ie. the OM that is living with her) there can be no place for her in our marriage or my D's life. She abandoned me and my D. That's about as far as I got! I have a habit of making big elaborate speeches and I really don't want to do that - just want to keep it simple, to the point and also to make sure she knows that the door will be open should she want to talk.

Just not sure how to approach this. Can somebody maybe give me some suggestions on how they did this?