I (M30) feel that my gf(F26) brings up her ex too much and might see him as a backup plan. How can I proceed?

My gf seemingly can’t do anything with me without bringing up how she and her ex did something similar or the exact same thing.

On top of that she said she is still friends with him but one night he sent her a drunk text and I told her she needed to block his number. She did immediately. However, I found out she later unblocked him and defends it by saying she needs to close an investment account they once shared together. She hasn’t taken initiative on closing the account even though I constantly am telling her she should because it’s her money.

I am not sure how to proceed because she also brings up how he used to pay all of her bills. I have told her I am not that well off but can live a pretty comfortable middle class life and I am fine with that.

Any advice would be greatly appreciated