Sorry you are dealing with this crap Catch44.....
I think you are being played....your WW is terrified of losing her safe and supportive Plan B.....
And I think she is still lying to you in a desperate attempt to minimize the likelihood of you leaving.
She has admitted PA (or more accurately you busted her cheating ass) with OM1 and OM3.....but swears OM2 was only kissing while she was away at her CWW's house in December....
Sounds like bullshit to me....here's why....
You know she was actively banging OM3 at this time....hell she went and banged him again at least on 1/2/17 from the timeline you have.
So why would she feel guilty about having sex with OM2 while at her cousin's?.....after all she was already neck deep in a PA with shitbag OM3.
I would bet dollars to donuts that OM2 is a full on PA as well....and she is still lying her ass off to you about what went down.
Why does this matter?
If she is still actively lying about and minimizing what she has done, then there is simply no way to safely even contemplate R......she is all about manipulating you to save her own cushy life......her begging and promises have NOTHING to do with any feelings of love or care for you.
While I personally don't besieve in giving cheaters a second chance, I always support a BS who wants to try R.....
But that said, I also won't hesitate to tell a BS to cut bait and save themselves from a hopeless situation......
I know you may not want to admit this to yourself yet, but I think that is where you are at....
Your WW is a serial cheat who actively used her clueless IC as a weapon against you to continue her life of deception sand betrayal.....
Think about that and let the reality of it sink in.....
She was busted red handed with POSOM1....and then essentially went on the warpath against you, her BH.....using her IC and her family as weapons to beat you into submission and silence so she could continue screwing other men.
Now that her continuing cheating has blown up in her face, she is desperately trying to convince you that THIS time it will be different.....while minimizing what she actually did with lying/TT.
My advice to you?.......It's too great a risk to try R with her again.
If you decide to stay for another round, and if she returns to being wayward again in the future after the present drama dies down......well, really you will have no one to blame for your and your kids pain at that point but yourself....
Not for the cheating (that is ALWAYS 100% on the scummy wayward).....but rather for staying around for even more pain and hurt to be inflicted on your family by your traitorous WW.
Save yourself and your kids.
Best of luck.
Cut her loose and file for D.