So my sister was in a toxic relationship with a guy who was my bestfriend. There was so much drama and a lot of it was out of their hands and they couldn't control the things going on. He decided to end things with her but the reason I'm nit sure because he's went and told people many different things and lies, etc. 1st it was because he didn't want to see her so sad all the time but he's went and told other people that she was the negative one (when it was both) and that he just didn't want anything to do with her anymore. So I'm not really sure if the real reason. Anyhow were all attending the same school and he acts obnoxious and immature whenever me and my sister pass him going to class and just being ridiculous. He even decided to follow my sister today!?! Anyone who knows me, knows that family and the people I care about I will do anything for and I am not afraid to fight or to tear his ass up, no matter the consequences, no matter who is around, etc. A lot of females and even males fight just for pettiness but what my sister went through and is still going through because of him, I wish on no body because her situation wasn't a typical and normal breakup. What can I do to help her not be so worried and to help her move on? Because honest to God if he keeps messing with her and tries to keep following her and trying to get a rise out of her, I will take it into my own hands because he also broke my trust as my bestfriend, he was like a brother to me. Advice anyone?