I did a similar thing to wibblywobblyfish. X probably had some spectrum disorder himself, surprise surprise, children do too
. I had to leave him, lived with parents. Saved off their backs really. Some more fortunate people (marriages intact, employed, qualified) who lack empathy get irate at that but in a few years I got in to a position where I could get off benefits. I work now. Wouldn't even qualify for FIS now. Good luck to anybody with small DC, recently single, or children with sn who are on benefits right now. It's no picnic.
Even when I was saving a lot I felt very worthless. Savings, and knowing I had a plan really helped. I'm a social welfare success story. I am a LP without a degree who got off benefits when her youngest was 8 and now I pay taxes. That is a social welfare success story in their eyes so anybody who condemns me can take a hike. I know I was lucky to be able to do that though, only thanks to living with family.