My friend is one of the smartest, funniest, coolest people I know. She's in a relationship with this narc who makes her cry 4/5 times they're together. He picks fights and throws full on temper tantrums in front of all her friends. After one of their fights she discovered he downloaded Tinder and Bumble and then deleted it when they made up. I could go on and on about how much he sucks but the point is she's being full on emotionally abused at this point. How do we intervene in a way that she'd actually internalize what we're saying and doesn't get defensive of him?