Am I wrong?

So backstory, my bf has a brother who lives with us. He is an addict. He talks poorly of my bf and me. He has a job but tells everyone he is broke and is ALWAYS borrowing money. Well he talked poorly of my bf to me last night & I told him off. He then borrows my bf truck & is gone all night (after drinking a 24 pack). I Told my bf I cant live like this anymore. He either goes or I do. Well he said it was unfair of me to do so & told me I could leave if I want. Even was telling my dog "oh imma miss you ".

He asked me support him with getting his brother help, I said I'll give until June (because he said we would move out if things don't change anyways) and if things don't I'm getting my own place. He got mad at me for it.

He has it in his head he can save his brother. His brother has put us in numerous financial binds & now it's taking a toll on our relationship.

I love my bf dearly but I don't want to live like this anymore.