My business partner and I grew up as best friends. We have fought tooth and nail, screamed at each other, cursed at each other, not talked to each other for days, threatened each other, etc. Mother Theresa type stuff!
The hardest part is understanding this: You are two different people who have different visions. It is for a very special purpose by design.
I will try to help you get past much of the arguing.
Try to understand the differences as two points on a triangle. There’s a reason you two connected. The wider the base, the bigger the triangle. The more differences you have, the more growth for the business and you personally because it creates emotion. Emotion is the energy of life. This goes for your relationship with your spouse as well.
Use the differences as fuel to come to a middle ground. Your partner will not write every correspondence the way you would. You will not do everything the way they want. Accept that now rather than trying to change them to do things your way. When you give in, you will see how easily they give in. People are mirrors!
You have to have faith in the other person for the majority of tasks and consult with each other on all the major issues.
Don’t get defensive when you screw up. Just own up to it, apologize with sincerity, and take some form of action to remedy your mistakes. Don’t blame your partner for screw-ups. People know when they screwed up 9 times out of 10. You would never yell at a child for making a mistake. That’s not how adults learn either. All they think about is how much of a jerk you are when you do that.
If you look at development in martial arts instructors, the real masters are so refined in the way they teach students. They will even crack jokes while they are able to get you to perform the kata correctly. Newly appointed instructors get frustrated and even angry when they communicate a correction.
Be the master.
Point it out to them calmly by using metaphors and stories or times when you made a mistake that were similar. Never blame someone without coming up with a better alternative either. That’s pointing out a problem and not offering a solution.
The transition in you has to go from being reactive to proactive.