Time to show this girl that love shouldn't be possesive!

I got reincarnated into the world of a trashy romance novel where the male lead is a total red flag and yet the female lead falls for him. Like, why?

To be honest I didn't want to interfere with the story much since I know from reading experience how that goes... but after some time I got bored. Learning magic costs lots of money, so why not use this chance to see how the plot plays out in real time? And while I'm at it, I should show the female lead that her relationship with the male lead isn't that healthy.