You're 5 months post convo. Sorry my heads in bits, are you still living together? What is your next step?
Stars, we are 5 months separated. He moved out in January this year, and the conversation about the split was had a year prior to that. It was the conversation that we will both make effort and try to change etc etc. Well I did, make the effort and made changes, but he didn't. So In October, the actually real discussion took place that he would be moving out, but we lived in the same house until January due to various factors. Those few months were not good, you could cut the tension with a knife, the dc picked up on it, actually it was horrible. BUT, it was during that time that actually sealed the deal for me iyswim, I saw that I could no longer live like that. I am not saying its all rosy now, some days a real struggle, but generally things are much easier. The dc are now getting used to the idea, they are less stressed and seem more positive..and I actually have some days with no stress which would never happen before. Next move....not sure on that one. I don't want to go back to how it was, he isn't going to change and I am not going to live like that again. So I am going to suggest divorce, just don't know when yet.... 
I never found that after the conversation, he picked up his game, ie
- dp has upped his game 1000%
- grooming
-new clothes
-tackling oustanding jobs
-supportive with kids
-seeking affection
-perfect dad
so, Welsh this must be incredibly difficult.