It makes sense to push through the divorce while she is still willing to make reasonable financial accommodations. In general the initial generosity of the guilty spouse evaporates pretty quickly - once she figures out how financially impacted she will be she may start to be a lot more difficult to negotiate with. It also can cause the fantasy fairytale to evaporate more quickly. You can always remarry or stop the divorce later if she turns around. But many LBSs have been burned by trying to wait and not ask for anything financially while their WAS ate cake and indulged their fantasy with their lover on the LBSs dime.
(I know you aren't aware of an affair and there might not be, but the odds favor it. Have you checked the phone records yet?)