Are you very sure there isn't an OW? This behavior can only explained by that, or that he is completely crazy. I am leaning toward option 1.
Remember, the obstinate spouse rarely tells you the truth. Believe nothing they say, and only 1/2 of what they do. My guess is that he told you to file for D because he doesn't really believe you would do it. Getting served with papers might wake him up really fast!
M(53), W(54),D(19) M-23, T-25 Bomb Drop - Dec.23, 2017 Ring and Piecing since March 2018