Me and my best friend are currently high school students. Recently, she got a new boyfriend since the start of school. He seemed like a pretty good guy at first and even hung out with us sometimes and seemed normal but overtime he got so possessive and told her how much it hurt to see her with me and he hates sharing her. So she stopped hanging out with me and barely texts me or calls me now. Before she stopped though, she used to tell me what he would say to her over text. Things like how he never has this problem of sharing with his friends and how she’s always on the phone with me (they call 24/7). He even persuaded her to just stop going to class and seeing me all together to the point it’s awkward to call her my best friend when I never see her anymore. A couple weeks ago during lunch, I saw them get into a big argument where he took her phone and wanted to go through our messages and she was trying to get it back but he wouldn’t let her. He looked really angry and she looked helpless. At some point of watching them I saw her crying and went to ask what happened. When I walked up to them he started cussing me out and telling me to “go the fuck away.” Later she texted me saying he had hit her and I asked why she was still with him and she said she still “loves” him but I know that’s not love. He goes through her phone all the time and HAS to have ALL her socials. I’m debating about telling her mom about this because I know if I do my friend will get mad but it seems like this relationship is heading in such a dark and dangerous path that I need to do something before she gets hurt even more. I’m just worried about her getting mad and ending the friendship but there’s nothing else I can do to get her to leave him. Or maybe it would be better if the friendship ended? This is a lot for me to keep to myself and I really want to help her out because after she got into a relationship she would tell me how she feels depressed and how she’s losing motivation for everything. Would I be TAH if I texted her mom?