Lex, I want to say I have been in your shoes. So I know how bad it feels. It shook me to the core to witness my W doing this.
What type of a conversation do you want to have with your W? What do you think is the problem in your situation? Where do you hope to arrive at by the end of your conversation?
When this happened to me, I had that conversation w/ my W, and there was a tearful, intense moment of reconciliation. But within days we were back right where we started. The underlying problem never got resolved. I'm not sure that the underlying problem is even correctly identified.
Good luck to you. Before you think about "how" to talk about it, you may want to think about "what" is the problem in your marriage.
Me: 50, MLC/WW 45 Young kids Nov 2015: BD1 Apr 2016: BD2 Jan 2017: W filed Feb 2017: D final