Am I being unreasonable?

So my husband started a conversation like "so our plans to go away this weekend , I cancelled them, and you're gonna be mad but I'm going on a boys trip this weekend" with his brother and his brothers friend. Now his brothers friend is a BAD influence. Trying to be a "rapper" doing coke off of chicks everywhere he goes (I've seen it in person) just a really wreckless irresponsible kid. The last time my husband went on a boys trip with these guys he spent $2000 in 2 days which we are still paying back. Now he wants to go again and go to the casinos again and said "I'll only spend $100" and is mad at me for being bothered by him going. Considering we're trying to move next month I explained we should save money. But I'm being "dramatic" am I missing something ?!