okay but it’s CLEAR Marinette’s hang ups about dating stem from:
From S4, believing she cannot date because her partner could never know why she has to randomly dart off at times. the toll of being a guardian and superhero (i.e never being able to go home and vent to the person you love). it puts them in direct danger (Monarch, akumas).
Re: above, she believes from Chat Blanc that Adrien simply knew she was Ladybug and “blabbed” and it somehow caused her beloved partner in crime, Chat Noir, to become Blanc and destroy the world.
So now, the guy she’s been in love with, Adrien, is finally into her. But so much is at stake now, and she’s got these confusing feelings for Chat Noir, including, if we speculate if those dream sequences are from Jubilation, that kiss - wedding scene.
And she’s got to put being Ladybug, the Guardian, in the forefront of all of that. She can’t risk losing Adrien or Chat Noir like that. So, this is my theory as to why Marinette says “No, I do not” to Adrien regarding his love. This shit is tearing her up.
Honestly, tangentially, it reminds me of the Sailor Moon movie Black Dream Hole. Usagi wants literally nothing else to be with Mamoru, just her and him, without chibimoon. She’s captured in a dream, and Dream Mamoru is hugging her, being intimate, telling her to stop fighting and to be with him, it’s okay if Chibimoon sleeps (IIRC, dies lmao). Basically, telling her everything she ever wants to be told: she’s the most important person to him. But Usagi puts being a senshi first, and says to him sadly, “you’re just as gorgeous in my dreams.” And tears herself away.