i Am PiSsEd

OK SO my best friend broke up with a guy bc he treated her like simplest shit and sexually harassed her. Then she got BACK TOGETHER WITH HIM and broke up with him again. BUT NOW, SHE CONTINUES TO TEXT HIM EVEN THOUGH ITS GIVING HER ANXIETY ATTACKS AND SHIT. Sorry i’m really upset because she is my best friend and i also have a little crush on her but do y’all have any advice????