The mediator is pushing to try and bring this to an end but he just keeps putting up blocks. 2 years ago he was desperate to have this D and yet his efforts are so half hearted
Reasons why they stall: 1) The paperwork is too much hassle (they want the "zipless" divorce where everything magically goes their way without them having to do any work). 2) There's a financial benefit to them to stalling the divorce (they're reluctant to part with a chunk of change they'll have to give you, or what they're giving you now is less than what they'll owe in support with a divorce) 3) They want to keep you as Plan B in case their fantasies of a different life don't work out 4) They're in denial about the financial realities of divorce and keep changing lawyers in hopes of finding one who will tll them what they want to hear instead of the truth about what they will owe you. 5) There's an OW who is pushing them to marry and they're using the excuse that they can't get YOU to finish the divorce as a way to keep the OW off their back.
Oh - and yes, most likely he had an affair even if you didn't discover it. Maybe only liaisons with foreign prostitutes, or an online long distance affair, or rarely they were a closeted homosexual. Also rarely there was a simple addiction (drugs or gambling) instead of an affair. But I'd say 98% of WAHs here have had an affair, and he shows the typical sxs otherwise.