What do you expect her to do, scream & shout? Plead for you to stay?
She doesn't know what else to do & this obviously isn't the first time you've had this conversation with her, so she's just trying to carry on with the day because whether you leave or not the washing up still needs to be done, people still need to eat etc..
Are you expecting her to help you?
That isn't her job, no matter who you think is responsible for the breakdown of your marriage.
If you are leaving, then you need to go right now.
You told her, now get out because it's over.
If you wanted time to sort yourself out, you've had the last forever when you knew this was coming but she didn't.
Pack your bags & get on with your life somewhere else.
Or do you want to stay for months, pretending to be in some sort of house share situation while really leaving all the washing up etc... to her as you consider dating someone else?
You had your chance to get yourself organised, so now it's time to go.
If that isn't 'convenient', well, breaking up is never convenient.
You are now intentionally torturing her by saying & staying.