So upset 😔

So my little sister is 18. She’s super cute. She’s been talking to this guy for over a year over Snapchat, but they’ve never met in person. He’s SUCH A DOUCHE. He’s constantly telling her horrible things about herself like “you’re so ugly” “no one will ever genuinely like you” and “anyone who tells you you’re pretty is just telling you what you want to hear”. I keep telling her to block him but she refuses. I just don’t understand why she lets herself continue to be treated that way. I think she’s really starting to believe the horrible things he’s saying. It just makes me so sad that I can’t do anything about it. ☹️