I had this crazy theory that before the backstory reveal in Black Widow and Guardians of the Galaxy 3, Black Widow and Rocket both shared their traumas pre-Endgame during the effects of the Snap.
Black Widow mentioned that she gets emails from Rocket at various times. While it wasn't stated what the emails were about (pretty much intel), I have a feeling they were discussing their pasts. After watching both films, both characters seemed to have a similar history of being experimentally and psychologically tortured by crazed villains with sadistic ideologies and hobbies (Dreykov and High Evolutionary). I know it seemed unlikely that they shared their pasts, but it would be interesting if they actually did!
Overall, that's my take! What do you guys think?