I too am worried that you say you owe the irs Tons of money. They could garnish his wages. And being 2 months behind on the house payment is no joke either. At 3 months they can foreclose.
That would mean you would get a notice to move within 24 hours.

What do you spend this $800 month on? Groceries?
And you say you have bad credit?

The relationship stinks. You know that. But you could get a job.

You could fudge it. Tell a friend to vouch for you that she has her own business and you've been working for her. When there's a will there's a way. Then you can help to get the mortgage current. Make a deal with IRS and get that paid too. You can be responsible if you want to. It's up to you.
Ask him for your phone back as you are going on job interviews and need to get back to prospective employers.

You obviously want to stay in this relationship. You may have learned to be mistreated by your mom and dads relationship.
You could go to a free DBSA NAMI support group.