AITAH for refusing to help my girlfriend pay off her credit card debt before we move in?

I’m 30 and my girlfriend’s 28 here is my dilemma. So we’ve been together almost three years. Things have been good overall. We’ve talked a lot about the future and were planning to move in together soon like actively browsing apartments kind of soon. Then last week she tells me she has around $9,000 in credit card debt. I didn’t know about it before. I asked why she didn’t mention it earlier and she said it was embarrassing and she thought she could get a handle on it before it became our problem. But here’s the thing now she wants to delay moving in unless I’m willing to help her pay it down. She floated the idea of me covering like $300–$500 a month to speed things up but I told her I wasn’t comfortable with that.

I don’t have any debt. I worked hard to stay that way. I’ve had my own money struggles so I’ve always been careful with spending. And while I don’t mind helping out here and there in a relationship I don’t think it’s fair to expect me to take on someone else’s financial mess especially before we even live together. She said I was being unsupportive and that if I really saw a future with her I’d be willing to invest in us. But to me that’s not what this is. It feels more like I’m being asked to bail her out and I’m just not okay with that.

Now things are awkward. She’s barely texting back and when we talk, she’s cold. I feel like I’m being punished for setting a boundary. But I also don’t want to start living together on the wrong foot feeling like I’m financially responsible for her past choices. So… AITAH for the choice that I made?