I gave my stbxw some personal information when we were in our rough spot right before we really went bad.

We were being amicable and "friends".. She felt bad about her past and the dates she was going on while we were married but separated..

She's now throwing it all in my face now and I'm seriously regretting opening up about it. She's under my skin right now.

Do not tell her shit. Grey rock right now. She will use it all against you, either in court, or just to instigate.