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Do you tell her what you are doing/going? Or do you just say “hey I made some plans and will be out”.

Why would you go out of your way to tell someone who wants to break your marriage where you are going to be all the time? That makes zero sense. Tell her nothing. If she asks, and only if she asks, then just say “I’m going out with friends.” And then leave immediately. Conversations with WAW/WS are the final nail in the coffin.

And be prepared mentally for interactions in advance. Exit conversations ASAP, as if talking to her is taking you away from fun and a real inconvenience

For example: If she says “Well why all the secrets, why won’t you tell me who you’re going out with?”

Old Brandon: “It’s not a girl, I love you, I’d never go on a date with another woman.”

New Brandon: *With grin and sparkle in your eyes* “Wouldn’t you like to know!”