Breaching a business partnership agreement

It is a business partnership agreement.

Before we start, we agreed that I will go to finance everything even the renewal of his car.

The only contribution he can do is marketing and client talks. His car has been renewed with all my money. Since we don't have the license at that time, I agreed to name the insurance with his wife's name.

Then, as we got the license and operated, but the sale was not enough, I tried my very best to sustain all the financial needs until I got drained already.

They were staying in my flat as what he offered for the value of the car was 50/50 share. He estimated the value and sold his car to me at 8K.

They stayed in my flat for four months without paying anything. So what I did, I charged their bills in the 8K equal value of the car until my balance completely clear out because of the charges.

Now, this guy suddenly withdrew his business partnership with me. And even took the car without giving me at least 50% of the value of it.

What should I do?