I agree with Labug, don't go into details of past/hurts events. Just make a general apology for any behaviors or actions that may have been embarrassing etc...

I'm also wondering if maybe you should let them know in the letter that the letter is a step in your recovery, nothing more nothing less? As they may think it's something you're doing because of your sitch...so I think intent should be made clear. That's just my opinion though, of course.

As far as the dating, I've been wondering things like that myself...maybe I'm just scared of the rejection b/c of it, but I figured the 3rd date would be a good time to let them know I was marriage/still technically married, if I felt I really liked the person.

But if it's brought up before then, I'd say of course be honest.

me: 30 H:30
tgthr:7 m:4
no kids
5 counseling sessions initiated by H as a LR: Oct 2012
long distance marriage b/c of work since Nov 2012
official BD: July 2013
nothing filed
1/1/14 I dropped the rope