I also was majorly, majorly deceived about my equity stake, even though I was one of the two all-in founders and built both of our products. I suggest you insis

I also was majorly, majorly deceived about my equity stake, even though I was one of the two all-in founders and built both of our products. I suggest you insist on helping with the initial legal. Have your own lawyer review the documents. Insist on seeing the cap table if you are mostly taking equity. I highly recommend calling references if you don't know your business partner well. Finally, I suggest playing a visible role in representing the company to the outside world. This way, your cofounder will have a difficult time hiding you from future investors.