No expert here, but I think you should read all of it. It's good to have a perspective from the other person's point of view, even if it's painful. For example, my W cheated. Obviously, my initial reactions were anger, resentment, fear, desperation, etc. But after all of that wore off (a little, it hasn't really worn off all the way) I read a couple books about infidelity where the author addresses both parties separately in the beginning of the book. I think you really have to understand what the other person is going through before you can determine how to react.
M46 W48 M11 T14 S11 D8 BD: 2016/05/27 In-home separation: 2016/11/23 Nesting: 2017/06/11 W moves out: 2018/01/07 W goes public with OM: 2018/07/12 I ask for a divorce: 2018/12/14