Yup... Ken just keep doin the TSO... You want to send a clear message to her with your actions that you know she's in contact and you are ACTING on it, you aren't threatening her, negotiating, begging, or pursuing her anymore... She breaks the house up, you ACT to protect it...

She will learn there are consequences for her behaviuor... She will confront you about the TSO, just tell her the same thing as before...

You are protecting your family
The affair is hurting everyone in this house
End the affair and participate in therapy
Until the affair is over you just leave in order to protect these children

that is a clear simple message she needs to hear REPETITIVELY and CONSISTENTLY from you when she challenges you... Do not just walk up to her and say this.. wait for her to ask why you are filling out the TSO and then you hit her with the reality script above