How is the equity of the company currently distributed? Make sure important foundation based details like this are set and firmly understood by all parties before moving forward any further.

Part of becoming a CEO involves taking lead, and being firm in deciding your direction. Share with your co-founder that you value his opinion, but that you are the lead decision maker at the end of the day. Things will go more smoothly if everyone is on the same page about this.

Good luck! Feel free to message me for a call anytime.