WDIM Agree long game - you need time to mentally prepare for what's coming and get the supports in place, as others have said.
Horrendous day yesterday - mentally and physically, not helped by X being useless as a wet paper bag. I have found out (from elsewhere) that he has someone else.
Pretty sure that nothing has happened yet, but his speciality is the Emotional Affair, so he can tell himself that he is being faithful 
It is laughable as, should he enter a relationship with this woman, it will just go the same way as the last one. Spent all day veering between distress and relief and was so sick of the toll this took on me that I wrote out a Survival Plan to help me deal with the feelings and also a list of the things I would say to him when I dumped him. Went to bed, had fab dreams and woke up feeling much stronger.
Thinking of you all today, and thanks for that song Hissy - going to listen to it now.