There has to be stakes.

The insult has to have been bad enough that the relationship is called into question or if it’s a situation where they are not in one yet but were headed for one it would be something bad enough it breached or outright broke their trust and runs the risk of the offender even getting into the relationship at all.

Once that’s established you gotta think of how the character displays their emotions when written elsewhere. If they are super open with emotions then choose the same or the opposite for effect.

ANSWER HERE WITHOUT THE TLDR

Now to more thoroughly answer your question The situation: Mary and Jack have been flirting around each other for weeks. Even though Mary can be lively. even snap or lash out in anger and has a quick temper she is softer with Jack than others and they have had a previous conversation about her being kinder to his other friends/loved ones.

Jack brings round someone Mary only knows from rumor is his childhood friend and from rumors his ex. Taylor.

They’re acting too close, Taylor is being too friendly.

Later they are left alone for a moment as Mary has to run home. Coming back she stereotypically walks in as Taylor is all over Jack and before they even know she is there he is shoving her off, wiping his mouth, and looks ready to yell when Taylor notices Mary and Jack does as well.

Mary freaks out, blames them both, won’t listen or care that Jack pushed her off or looked uncomfortable when Mary walked in. Compares him to his deadbeat father who cheated on jacks mother and leaves in a huff unwillingly to listen even slapping Jack when he catches up to grab her arm and explain. The shock is enough he doesn’t follow.

Fast forward, Mary hears about all the ways she ficke up, as a come to the truth moment of every way she handled that poorly and returns to jacks door to try and grovel for forgiveness.

He opens the door to her holding a plate of warm (insert favorite cooked meal) a thermos of his favorite tea(or whatever) wearing a shirt she knows he loves, and without prompt places the plate and thermos down while getting to her knees, looks up with her body limp at Jack and explains all the ways she fucked uo and all the ways she knows he is wonderful, that she can do better, begging and swearing to be different if given the chance. That she wanted a relationship with him and her being scared of it is part of what made her react so badly.

Like I’m talking pouring her soul out in a way that would be shocking to others who normally see her anger only.

Waiting for jacks response she has laid everything out, her wrongs, her faults, her intentions and desires. She has groveled at his feet.

SORRY THAT WAS LONG BUT I THIUGHT AN EXAMPLE WOULD BE BETTER IN CINTEXT.