OK..

"I say something like "let this be the final apology and my trust that our marriage would have been savable, but I let you do what you feel is the right choice; I am not going to file it myself"?

Because I can step away from the pain you are going through I can see what you say from a different angle.

Is she stupid?.. do you really have to write down to notify her you don't want her to leave? or is 'a last roll of the dice' kind of vibe to it.

Which means than rather than allowing her to naturally see something to want to come back to, you are trying essentially make her feel a little sad for leaving you if your honest and 'maybe' sway her opinion.

I personally think that you know deep down that 'at the moment' you arent the guy for her. So you overcompensate by trying to get some validation.

Just give it time. Truly focus on yourself and what will be will be.