THIS GUY IS HURTING MY FRIEND!!! please help me!

Chloe
This one guy is so mean to her and I can't explain how mean he is to her. She cries almost every night. And she's having a hard time. Last night he was texting her some mean things and she texted me saying some really sad things. And she thinks this is all her fault but it's not he's as ass!! And then I texted her in the morning and she normally replies back but she's not answering for some reason and idk what to do??? She's really struggling!! The guy basically told her to kill her herself and that he wouldn't even noticed and so many mean things like that. And I'm worried because she's not replying!! Idk what to do