While there is no "panic" to proceed with Divorce, the Separation Agreement should still be done. But there isn't really a time limit.
I really don't like the idea of doing nothing but I understand that I need to know what to do 'sequentially' and WHY I'm doing something so my actions are consistent and aligned with my position and/or boundaries.
And I think my answer just answered that question.
The affair crosses the boundary so I proceed with Separation Agreement. THAT is my motivation. MY BOUNDARY.