Wayward Wife and the Way of LRT

[Defacto]

So W called me tonight and asked if somehow screenshots got out of the text messages I uncovered back in January between her and OM. I asked her what she meant. W told me that OM's W confronted OM and mentioned some text messages.

I told W that I talked with OM's W today. And then she flips out.

"Why would I do that?"
"You didn't understand the nature of our relationship"
"Those TM's were 4 months old."
"You're destroying another person's life/family."

I told W I did it because OM's W needed to know and I did it for our family.

Then W proceeds to tell me that I destroyed our family long before this happened. W says that I never tried to work on M when she was trying. I replied by saying how could we work on M when you were involved with OM. I reminded her that I told her I was willing to work on M as long as she agreed to NC. W then repeats that I didn't understand nature of her relationship with OM, etc.

Then W proceeds to threaten me and says she will fight for full custody of kids because I'm untrustworthy, etc. Expectedly, W blames all of this on my decision to tell OM's W.

W tells me that our M is definitely over and she will be filing for D. I tell W that I do not want a D and that she will have to initiate it.
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Later, W calls and begins asking for all my basic stats so she can file the divorce paperwork. I comply and am very casual on phone, even joking around with W. Then W starts asking for account numbers and I ask her if we can finish this up some other time. W agrees.
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Wow, is this a pretty common response to telling OM's W? My W seems pretty serious and determined.

What should my next step be?