Figuring this life situation?

I'm wondering why your biological father left. you said he'd explain everything. was it a "reasonable" explanation? it seems like you REALLY don't trust the step-dad. do you trust your biological father more? I'm also wondering if the step-father is abusive toward you your mom or his kids. because if he is you should definitely tell someone becuase abuse is NEVER okay. and if he is that bad of an alcoholic he really should get some help. i would tell your real dad about step-dads issues. but i wouldn't tell step-dad about you talking to your real dad. alcoholics behave irrationally and you may stir something up that you may regret. if he were stable I would say tell him. but since he's not I fear you may put yourself in danger. perhaps your real dad can ist you in providing finances so you can get your own place or dorm at a different school. if you think he is more trustworthy than step-dad then maybe you could try living with him. since I'm not sure about why he left I can't make any judgements or essments about his trustworthiness.