The best advice I ever got for dealing with communication was only to answer questions.

Unless there’s a question which requires you to communicate with her - do not.

And do not initiate communication.

The way a WW’s brain works (or the remnants of where there used to be a brain) is like this ... “he’s being nice for a couple of cupcakes even though I’m banging another guy. He’s still on the hook. I can have him back anytime I want. He’s a weak man. He’s unattractive. I can do better. I’ll keep looking elsewhere.”

Unless it’s a direct question or something which REQUIRES your response, ignore. Eat the cupcakes and then forget about it - get on with YOUR life. Gym, exercise, socialise, work, renovate, paint a room, read a book, take a class, holiday/small getaway.

You have about 80 laps around the sun and then it’s all over. Is how you respond to cupcakes really going to make or break it?