I'm so sorry to hear that your H didn't tell you about filing. Mine didn't either, even when given the opportunity to do so days afterwards. So cowardly.

How will this affect your mediation agreement? Will it just formalize it and dissolve the M? Sorry, I have no idea how that sort of thing works.

Me- 40 H- 41
S8, D5, S4
M 19 y T 23
Bomb drop 6/2013
H asked for/filed for D 9/2014
22 yo OW discovered 9/19/14 they're engaged and living together