What a horrible thing to read. I am so sorry you found that. My H is/was the pursuer in the A that he had with a married woman. I take that back, she pursued him at first, and now he can't let go. UGH
Its so hard to live this, every day, time drags on. But we have to ride it out, visit here, do things to distract ourselves and look at the big picture.
You aren't ready for it to end, so honestly (like me) there is nothing you can do but wait. No pressure, no pursuing, and space in between you guys. But be a loving friend, not distant.