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Explanation: The way you wrote it looks like a statement and I already explained what it means. There are two possibilities:
If the original was said with a "li" between "kazav" i "deka" like this:
A jas vi kazav li deka ova e devojka mi?
It will mean:
Have I told you this is my girlfriend?
Sometimes native speakers tend to use a statement form to pose a question (this might have been a case), and they will say it just like you wrote it but the intonation of the voice will go up and down instead beeing flat.