I often help my girlfriend Wei Zi.

You must refuse, even if it is a good girlfriend. Your best friend's money is also hard-earned money, so you must refuse it.

You two have a good relationship. I think you should mention this to her and see what she really thinks. If she gives you money after you mention it, someone may have forgotten it and suddenly remembered it. If you mention it and there is no response, then you should be clear about your attitude.

If it's a lot of money for you, I think it's necessary to mention it, because I think the most important thing for friends is to say everything.

Moreover, such a girlfriend is really not worth your in-depth communication, and it will only make her feel taken for granted, so make it clear when appropriate! Don't bother yourself!