Listen to Custy- she knows about housing!
Aslso Edam is right about the house, but even if you decuide to let it go.... I did that with my ex rather than become 'attached' to him for years of fighting amd stress, and although we have ahd ahrd times I have never ever regretted it. I furnished that house, paid all the legal fees to buy it, contributed to the mortgage- and that worth every penny to eventually rid myself of the prat!
Shelter have a helpline, they can take a bit of getting through to, but are V V good.
Hugs XX You KNOW you are best rid of this man, he's bad news. Might be wroth tipping off DSD's Mum though, as the house with the cat etc does not sound appropriate for him to have a child in- even if she can't cope there are limits!