Think about how blindsided you felt when your W dropped the bomb on you. It hurt and shocked you. So, keeping that in mind if you are now prepared to file for divorce I would let her know AFTER you filed and tell her she can expect to be served (or however it works in Texas) on xx day.

If you feel the need to tell her prior to filing I would make it short and simple and just let her know that you feel all possibilities have been exhausted to reconcile the M and you have had papers drawn up and will be executing them tomorrow and she can expect to receive them by xx date. Let her know that you have been counseled in depth by an attny and your goal is to find a fair and reasonable way to dissolve the marriage/finances/assets and find the best possible solutions for custody for the children then END THE TALK.

She will not like this but if you really are ready to do this and it's not a ploy of some sort on your part then be prepared to be strong and follow through with it. Be kind, be detached and wrap your head around the mindset of this being about business.

Is this something you are considering? If so, why?