The excuses I heard in counseling were trivial. 'He watched too many sports, never did the dishes', that kind of thing. All the while she was meeting up with OM in local hotel rooms.
I hear ya. The ones I heard, when my wife was having her affair, was "he spends too much time on his computer" (on my laptop, sitting across the room on the other couch from her, 8' away, watching the same TV show), and "he spends too much time at those damned ballfields" (coaching our sons). Boy; some guys are out at the bars, y'know?