Have him sign an IP transfer agreement. Then: Give him source code. Or get a co-founder you trust. Or go solo. Or close up and do something else. Btw, your c

Have him sign an IP transfer agreement. Then: Give him source code. Or get a co-founder you trust. Or go solo. Or close up and do something else. Btw, your company is worth zero right now anyway, most likely. Go ahead and try to sell your company right now. Get a firm bid.