what to buy your gf for christmas

Well, that depends on what she likes! Does she have any hobbies or interests that you could get her a gift related to? Or maybe she has something that she's always wanted but never bought herself? You could also try asking her friends or family for ideas, or even surprise her with something unexpected that you know she'll love. The most important thing is that the gift comes from the heart and shows how much you care about her.