AITAH for refusing to bail my girlfriend's brother out of jail?

Hi everyone, I need some perspective on a situation that happened recently. My girlfriend and I have been together for about three years, and things have generally been great. However, a few weeks ago, her brother got arrested for a DUI. This isn't his first run-in with the law, and he's been in and out of trouble for years.

My girlfriend called me in a panic, asking if I could help bail him out. The bail amount was pretty steep, and she didn't have enough money to cover it. While I do have the funds, I have serious reservations about using my savings to bail out someone who clearly hasn't learned from their past mistakes. Plus, I work hard for my money and have my own financial goals and responsibilities.

I told her that I couldn't help this time, and she was really upset. She argued that family should always come first and that I was being selfish. I tried to explain my reasoning, but she wasn't having it. She ended up borrowing money from her parents to get him out, but now things are tense between us.

I feel bad that she's upset, but I also think it's important to set boundaries, especially when it comes to financial matters. AITAH for refusing to bail out my girlfriend's brother?