Yes, I can relate to that. The move sounds good for lots of reasons. Fresh start with support. You may find that in a couple of years your stbx will want a relationship with his kids again (that was my experience with a mean and angry spewer) They than have trouble understanding why their children don't roll out the red carpet, but are cautious and guarded. Then again he might vanish into the sunset. But as Snodderly points out they rarely leave us alone for good.
On the post, again typical MLC behaviour. Someone else;s problem as far as he is concerned. Not focused on anything really. Probably doing his job on auto-pilot with good support from above and below.
