Well done Rachel for not lowering yourself to a level of OW and responding to nasty messages. Block her, delete phone number and crack on with your life. You know you have done nothing wrong, she can figure out her own life. Not sure why she is so keen on saving your H...but whatever each to their own.
There is a lot of drama to start with for some it continues, for others like me its all goes quiet woth not much happening, which is in many ways as difficult, as it feels like limbo.
All i can say is that from your messages you seem to getting to a better place, more stable, getting your priorities right and letting his drama play out but as far away from you and the kids as possible. Just keep detaching and moving forward.