What do you do? The obvious answer, I would think, is to not continue doing what you're doing.

Your partner? A leach. Why would he care about a job and contributing to your 'household' when it's been at the point wherein you supported three people who you have never been 'obligated' to support? People go through tough times. People need help. Of course it's a good thing, when one is financially able, to offer not only love and support, but financial assistance when needed, but that's not what is happening here.

What do you do? Get your legal and financial ducks in a row, leave, and start building your own happiness and pay down that debt.