Keep in mind that your WH is in poor mental health (based on what you've said here). We can't expect such people to make reasonable and wise choices. Marriages are hard enough without those kinds of issues... but with them....
This doesn't change anything for you, but it might take a bit off your frustration.
Me: 50, MLC/WW 45 Young kids Nov 2015: BD1 Apr 2016: BD2 Jan 2017: W filed Feb 2017: D final