Is this the end of my marriage?

[P17]

Okay, new draft:

"
Dear W,

I am writing to you about our current situation.

I will no longer stand by and accept your A and pretend that we are still a loving happy family.

I have decided that there should only be contact between us for two reasons. To either discuss the reconciliation of our marriage or the potential end of our marriage. The first one I can't discuss while you have invited a third person into our marriage and the second one is best left to solicitors, I think.

I have asked IM to act as an intermediary between us. This will protect D and I from any unnecessary contact. You can either speak or text IM on ....

In the meantime, D and I must move on with our lives without you.

P17
"

Comments or even any other options?

My plan at the moment (and I don't want to make any plans because of how I feel) is to do this next week. That is when the current 'scheduled' dates runs out with my D (the 23rd is the last day planned).