i’m really scared

i can’t live with my dad anymore he makes me feel horrible all the time. he does things then tries to make me believe it’s my fault. he bans me from seeing people that mean a lot to me. he is emotionally abusive and so hard to live with. but i’m scared he’s going to kill him self he has always been emotionally unstable but if i leave him i’m scared that will just send him over the edge. i can’t be the reason he kills himself that would kill me. at the same time my sister needs to get out of this situation she has been through so much she doesn’t need anything else. i feel like i have to choose between my sister and i or my dad.