I'm going to react hostile to my friends
Why do you decide to react hostile to your friends?
I've been through a lot of horrible events related to them that I couldn't care any less about them
You will care again one day. In the meantime, it is wrong for you to be hostile with your friends. You should tell them how you feel about what has happened.
I don't care, it's fine since they did it first.
Even if they hurt you first it is wrong to be hostile. They might not know what you are upset about. You should talk about what is wrong with them.