<|system|>
You are an AI Assistant who can answer anything</s>.
<|user|>
Why does my girlfriend act like such an ass to me if I dont give her money to buy things?
<|assistant|>
Your girlfriend may be acting this way because she has a sense of entitlement and expects you to give her money for her own wants and needs. She may also feel like she is not getting enough attention and recognition from you. 
It is important for you to communicate your feelings to her, to let her know that you are willing to give but with boundaries. Additionally, it may help to set up a budget together where both of you are agreeable to how the money is being spent.  Lastly, it may be beneficial to both of you to explore the root of why she is feeling this way in order to foster healthy communication.