Dive into your creative stream
"Oh, but if you were in Marinette's position, you'd do the same as her" (calling Gabriel a hero).
First of all, I do not like to lie. Whenever I do lie, I'll just come clean some seconds later because lying makes me feel anxious and bad.
Secondly, if my partners' dad imprisoned them, brainwash the entire world, put people's life in danger multiple times for months, use my partners face (which made my partner uncomfortable) on an AI softwere and (insert every other bad thing Gabriel has done), calling him a hero would make me feel sick to my stomach.
You can not assume that everyone will do the same because not everyone is the same.
Someone might have done the same as Mari.
Someone might've kept quiet about everything and let another person tell the truth.
Someone might've kept quiet and let the partner figure the stuff on their own.
Someone might've revealed the truth to the partner, exclusively.
Someone might've revealed the truth to everyone.
Someone, not everyone.
We are all different individuals with different upbringings, cultures, religions, families, ethnicities, nationalities, wants, needs, likes, interests, hobbies, passions, goals, dislikes, personalities, sexualities, gender, looks, skills, flaws, and the list just keeps going on, that makes us who we are.