How to make Unromantic girlfriend romantic?

I ask u guys ofcoz I'm losing my patience, as I said, yes, she is cold hearted girlfriend, becoz of her behaviors I sometimes think that she doesn't actually love me. But yesterday I have chatted with her sister and told about my problems, then she said me that my girlfriend really loves me. She also said that when my girlfriend was sick and I couldn't contact her, her sister ask her that she should breakup with me and she answered no, she also confessed to her sister that how I'm always so kind to her and how I love her. Her sister told me that she is sure my girlfriend loves me. I'm was a lot happy but I thought if so, why she didn't show her love to me? Why she acted so cold towards me? Why she doesn't care about my feeling? I thought and thought and thought and then I hav found the answer, she is unromantic type. So I want her to be more romantic. Ofcoz I can't stand her behaviors. I talked directly to her and nothing was changed. Ifcoz I need u guys' help.


(We broke up once becoz of her coldness, but both of us miss so much each other and now we are couple as before. I really love her and I don't want break ups anymore. )
How to make Unromantic girlfriend romantic?
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