Here is an observation from my other BFF who was also a victim of a WW. He alos supervised an office where there was a lot of male/female project teams and a hotbed of infidelity.
1 WW/WH(OM1) begin affair. Its romance for her, and sex for him
2 WW does all kind of sex acts she thought were disgusting previously because she wants to lure/trap WH in and get her claws into him
3 WW pushes for divorce wants more time and attention from WH. WH drags his feet because he has all the benefits and none of the responsibilities of a relationship.
4 WW gets her divorce. WH bails because he doesnt want to lose all his assets. WH reconciles with BW.
5 WW tries to reconcile with BH(plan B). When this happens, BFF told me to be prepared and squash her like a bug. says she hurt you bad, do you want to go thru that again? He said in the one sitch where there was reconciliation, the WW cheated again and the BH was so defeated he just pretended he didnt know.
BFF said he would go to Vegas and bet the house that this is how my sitch is going to turn out. He seemed pretty confident.
Now before I get flamed this is one observation from one guy who only spoke to male coworkers. I have no doubt there are many variations on this theme.