What is the best Gift to present to your sweetheart on the valentine day

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I have a girlfriend which I love most, but whenever Valentine Day is knocking on the door, I won't know what to buy for her so that I can make her happy on that day, also I don't want to ask her what she love most that can be given to her during a day like that, so please tell me what I can buy so that the Valentine Day will be sweet to both of us. Also she normally complain of thing I have already bought for her during the past VAL, telling me that I am not good in presenting gifts, so please your response will be highly appreciated.