Feel like giving up.......

Hey guys.
I'm having a hard time.

Separated for almost nine-months (common-law), I ended it with my N.
Have not responded to any of his hoovering or met him in person for months.
Refuse all calls ; only text/email in regard to our child with whom he has visitation ( unsupervised now ) ; I have to drive Ted to and from him as he lost his license. ( I pay the gas )
God I wish for NC!!!!!
Due to recent recovery I've been back to work since January. I'm still sick but didn't want N to use my disability against me in custody.
In order to have as little contact as possible, I gave him the business we created 15 years ago, the entire contents of my house, the vehicles, and my family didn't pursue him for the loads of money they lent him and invested in his business. I paid off all his debts incurred under my name. ( his credit was too bad ). I still pay his health insurance and am covering the full mortgage, utilities, everything. Never asked him for a cent. He doesn't even pay child support. ( I supported him through most of the relationship although he made three times as much with the business) STUPID!
He is suing me for my house now, after he found out I must sell due to a judge granting Ted and my relocation.
The house was my fathers down payment, its under my name only mortgage and deed. I saved it from foreclosure last year and made the vast majority of payments; including household expenses.
It gets worse, the mortgage is behind and I can't get a sale as the N's lawyer insists the N gets a say in his equitable interest. It's been listed way too high and can't sell. I can't lower the listing price unless N agrees. He won't.I'm fucked.
Why does this happen? If I lose the house he can still sue me.

We can't win can we?
Even the courts allow these people to continue their abuse and control.