How do you have a romantic personality?

I do romanitc things for my girl friend, i buy her flowers all the time, suprise her with thing like love letters, i make crossword with queations like were was our first kiss.... i do this all the time, atleast a couple times a week, why does my girlfriend seem unhappy with it, she says i dont have a romantic personality, what does that mean? Also she doesnt seem that interested in the love letters i give her, once she said she will read it in a minute and read it 15 minutes after i gave it too her.???? Can anyone explain this?