Should I always be helpful to friends or respect my interests first?

Anonymous
I have a friend who keeps asking me to solve her math doubts online and I do it even if I'm busy cuz she's a good friend of mine. The questions are very easy compared to what I usually solve. In the beginning of covid we used to text each other a lot and discuss topics of mutual interest along with the doubts. Recently she has been texting me a lot and mostly just asks me for doubts only. Somedays I feel I'm disrespecting my own goals. Conversation isn't natural like it used to be between us. Is she being a fake friend (i. e-is she using me) or am I being too paranoid? Also, do give me advice on how I should respond to this
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GirlGuy
Updates:
14 d
I'll be more concentrated on my interests from now on thanks
Should I always be helpful to friends or respect my interests first?
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