I thought I wold pay you a visit and see what you have been up to. It seems like you are getting down to the nitty gritty. Not the best part by any stretch of the imagination.
I read that note that your H left and my first reaction was to actually lol, I really did. I know it's not a funny sitch, but to write a note like that and expect you to view it with sympathy is SO funny. I always find it amusing when people precede a sentence with "I'm not doing / asking for xxxx but" What that almost always means is that without a shadow of doubt xxxx is EXACTLY what they are doing / asking for.
To my mind, there is little or no point in meeting prior to mediation apart from that fact that he will try to get you all emotional and coerce you into agreeing something that will benefit HIM. (Hence all the apologies and soft soaping in his note - that was setting the tone for the meeting) Even less point if you have stated categorically that you will NOT meet if OW is still in the frame.
If this is the first time bancruptcy has been mentioned, that may be his 'killer blow' to get you to capitulate. That aint gonna work though is it:
Hang on to your gut feelings, stick with the legals and ignore that symPATHETIC letter he left you.