I usually use boku and my girlfriend sometimes calls me boku, whether she's talking to me or about me to someone else. There's no confusion because she couldn't

I usually use boku and my girlfriend sometimes calls me boku, whether she's talking to me or about me to someone else. There's no confusion because she couldn't be using boku to mean herself. I'm not a linguist, but it seems like there's no grammatical difference between first/second/third person in Japanese - you can consider all the sentences to be in third person.