Was 50-50 on a startup, co-founder wanted to give me 100% more share in exchange for letting his love one join as co-founder. Turned it down once I figured out

Was 50-50 on a startup, co-founder wanted to give me 100% more share in exchange for letting his love one join as co-founder. Turned it down once I figured out that I would no longer be a controlling owner. Caveat: pay attention to the backend deals and overall picture.