How do I handle my dad being an dickhead?

Unless you have to stay with him when your mother leaves than you don’t have to tell him anything. Your parents got divorced for a reason and your father has no right to get upset about how she wants to live her life. It’s no longer his business and he shouldn’t be stressing you out because of his own feelings. Let him know that you don’t like how he reacts when you tell him she’s left, so if he doesn’t stop freaking out you won’t tell him anymore because you and your mother owe him no explanation, and the fact the you ever told him should be apprietiated.

I think you will have to talk to him. you can’t live life worrying about having to tell him whenever she leaves. I think you know you have to tell him exactly what you feel. set a date and dont wimp out. give him tea and tell him that he needs to listen to you. tell him what you want. I think you should make it clear that you have to get this off your chest, you know he is upset and you can only help him if he lets you, you cant help him if you are scared to talk to him. I dont know what your dad is like, but he cares about (I hope) and that should be enough to get him to listen. best of luck, hope it all go’s well. if you need more help I can give it. =)