Don't panic.

I went through the exact same thing.

She's manipulating you. Are you telling me that she's going to end your marriage over 2 weeks of you detaching? No way, I'm not buying it.

Here's the thing, she left you a long time ago. She left before you even experienced the bomb drop. More than likely she's probably feeling guilty and to keep her train in motion, she's going to project all this crap on you to justify in her mind she needs to move forward.

Do not react. You can respond "I need time to digest what you have texted me". And leave it at that. But do not get sucked into a relationship convo. It will not end well. Instead, keep buying yourself time so that things can calm down.

You acting confident right now is super important. Don't act cocky but you cannot let her see you sweat.

And if you start begging her, I promise you will not like the result.