How do I begin piecing??

[runningoutoftime]

I believe you should just focus on friendship. Don't expect anything from him at this time. Just be a great listener and good friend, and if the relationship starts growing then you might ask questions. But I'd go very very slow and take plenty of time to get there. Chances are neither you nor him are ready to go over the whole thing. But when you do get there (in 6 months or later) try to focus on important stuff like, What was it about the relationship with OW (what did he "get" out of it) that was missing in the marriage? How might the marriage fulfill these needs? Be very careful that you don't blame or end up shaming him in any way. Try to make it into something you both can learn and grow from.