This is actually a sentence with a semantic problem. (^-^) Because 【一直】 and 【老】 are synonyms. The correct usage is to choose one of them, like this: 【我不想一直让你花钱】 Or【我不想老让你花钱】 You don't see much of the word “old” which is very colloquial; its written form is 【常常】 or 【经常】 that you maybe see them more often in textbooks. Hi, I'm very happy to answer questions like this. I know the level of my students, so I usually answer them in Chinese. But here I don't know everyone's level, so to make it easier for you to understand, I've explained it in English. 谢谢阅读～(^_^)v