My 12yr old said she does want to live anymore

Im a 30ye old woman that got pregnant at 17 n had my daughter at 18. I left her dad when she was almost 3yrs old but most of that time he was incarcerated since she was 10months. I’ve moved on, have been with this guy foe 8yrs and everything was GREAT but 2years ago his brother (which they were EXTREMELY CLOSED) passed away and nothing’s been the same. He’s cheated and we’re to the point of separating because I cant take it any more. He ALWAYS wants to be by himself doing projects in the garage and never really gets involved with us or any of his cousins anymore. He is 2 years younger than me but me but to my daughter that’s her that. Today shw told me that she doesnt want to live because her life has been getting worse and worse with us separating and her being bullied at school. I was able to calmed her down but deep down im dying inside and idk what to do or who to turn to. Sorry I just needed to bent out.