You know your H better than anyone. If you are scared of him then I would definitely go dark. I know you have kids together but if he is on drugs, I wouldn't worry about a co-parenting plan right now with him. If he wants to see them or know what is going on with them, he can contact you!
Try that for awhile and see where it takes you next.
M48 H53 M16 T18 S16 D13 SS30 H drops bomb PA/8-30-09 H leaves 12-30-09 D filed by H 2-10 H asks to come home 4-11 Piecing