I don't know about the law in TX but here in Ca you can file for a legal seperation to protect from the financial aspects of seperated spouses actions...that is what I did and I am very glad I did as he ran up over 200K in debt!!!...yep, you read that number correctly! Now if he files Bankruptcy he will owe the IRS taxes on that money because they view it as income if you don't repay it!!!...his problem, not mine
MLC is a very odd thing...never believed in it until I saw my H get into it...and he went full steam ahead once it got rolling with the EA turned PA...personally I think they have to run as fast as they can to keep up with themselves and not look back...not see or feel the path of distruction that they are leaving...my H told me he raised the girls and laid a good foundation for our son so they would all be fine without him!!!
The worst day after the bomb was the one when "I" had to tell the kids that their dad snuck out in the middle of the night because he couldn't face them...
So my point is as bad as all of this seems...and as lost as your H is right now...and as "things appear" to you...it really isn't over yet...his moving on...is running from reality but like the tortoise and the hair...reality has a way of catching up with the fantasy...slowly but surely...that is when you will know what your H is really made of...until then just be you...focus on the kids...work on yourself...self improvement is the best emotional boost you can give yourself and your children...