Probably has to do with the fact that most of us grew up with cis/het parents who happened to be awful boomers, and thus developed a ton of shitty schemas when it comes to relationship dynamics.

Edit: I happen to be in a happy and loving marriage with my wife (I’m a guy), but I grew up with a single mother we who was constantly in and out of relationships ranging from emotionally dead to outright abusive, so I uncover new baggage in my psyche pretty much daily.