My father went through the same thing. We were working 70+ hours a week while the partner worked 2 hours a day. He ended up buying out the other half, but they had no partnership documentation and all contracts were in my fathers name. Listen to the other guys and don't make the same mistake he did, if contracts, assets and debts are in your name show your "partner" to the door. If your company is a partnership, I would ask your lawyer/accountant on what your next move should be, but I'm pretty sure they'll tell you to buy him out and move on.