serious d&d DM question, how do I tell a player that they are acting more like a co-DM/DM than a player and its not working for the campaign. (Explanation under cut) Any advice would be appreciated.
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So I am currently running a dnd campaign and one player refuses to share their character backstory with me or anything else that they want to incorporate into the story, which prevents me from adding it to the story like they want. So when it comes up in a session they interrupt me to take the story-telling reins for themself, effectively stopping me and the other players from continuing with establishing plot together. And its annoying me (And other players) a lot because I know nothing of their plans and in the past when I've told them that certain things couldn't work because of plot I've already established, they have gotten angry at me.
Most recently they have been setting up something (A trap or monster? I'm honestly not quite sure) within a house they are staying at in game (They have told me nothing of this prior and interrupted me during game to explain what would happen) and they expect me to go along with it when I have expressed that when they interrupt me and try and bring the players on their own side plot is not a cooperative playing style. This player has also attempted to leave the party several times already which everyone has expressed displeasure over.
I don't know how to approach the topic with them gently (I'm not very good with tone) and am not sure how they would react if I told them flat out. I feel a little out of options, advice is welcome.












