Girlfriend used my debit card without my permission. This isn't the first time. What should I do?

nerdBro22
So I have been dating my girlfriend for close to 2 years now. She is terrible with her money, and is usually broke before her next paycheck. I buy her food and simple things when this happens, but it still always bothers me. She doesn't watch her spending because she lives with me and knows if she runs out of money she can just use mine basically. I make more than her, but I also pay basically all the bills. She spends her money on herself mostly and very rarely pitches in on the bills. Only if I make it a big deal, even then she doesn't pay her full share.

Anyway, a few times my debit card has ended up in her possession. It has never been a lot of money, but it is the point. She is stealing from me, and using my money without my permission. I have yelled at her for this but she never seems to get the point cause she keeps doing it. It is usually just for cigs, but once she "accidentally" used my card for 50 bucks at home depot.

Anyway today I noticed an 8 dollar charge on my card from where she works, it has to be her. But I had my card. But then I remembered she has used my card a while back (this time with my permission), forgot to give it back to me and I asked her to send me a pic of the card so I could get lunch delivered (needed the card numbers) She has been broke this week, and I think she used those numbers to get lunch or something. If she would have asked I wouldn't have cared, but she does it behind my back and I find out later when I check my bank.

I am tired of this. I feel like I am her father sometimes. She doesn't seem to care, and gets mad when I get mad about her using my card. She makes me seem like a huge asshole when she is the one that stole from me. Am I right to be angry? We do live together so I understand sharing expenses, but I am the only one sharing. Should I dump this girl? I love her, but she shows no signs of changing. I guess I could just change my pin, but I feel like if I can't trust her with this, how will we ever get married?

Updates
+1 y
Well, I talked to her. She denied it a few more times, then eventually admitted to using the photos she took of my card to buy something, but said she had done it "awhile" ago, and didn't think I would care. Well, why would you not tell me and lie about it if you thought I wouldn't care? This is after I had told her never to use my card without my permission ever again. She must think I'm an idiot.

I think I have decided to "cut that bitch off". I can't be with someone who steals from me.
Girlfriend used my debit card without my permission. This isn't the first time. What should I do?
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