So I am DMing for the first time for a group of 4 players. We are running a custom campaign that I am writing while they play. The current objective for the party is to create a successful mercenary guild. Now I have one player, and he usually DM's for us, who is being very controlling with the party. This wouldn't be a big issue if he had been voted the guild leader by the party, but he's not and he specifically stated that he had no desire to be the leader of the party but somehow won a 3 to 1 vote against having a democratic council instead of a guild leader. So now we have a council because he wanted one. He either argues with the party until they see things his way or makes the decisions behind their backs
So what do I do, the campaign is supposed to be more roleplay heavy between the party while I provide them with any information they need while remaining more of an outide force, but he just talks to me until he's come to a decision and then tells everyone what the party is going to be doing.
So far he has decided the guildhouse location and emblem on his own and when there was a bit of infighting at an inn (<---- see what I did there), he took it apon himself to step in and scold the party members for their behavior. His character is super strict and views anything the rest of the party does as shenanigans and nonsense, did I mention that he described his character as overly optimistic when everyone gave there backstories.
I want everyone to play their characters the way they want, thats one of the best parts about being a player, and I don't want to offend him.
Fellow DM's how do I handle such a controlling character?