I have this student who I've been teaching for almost 4 years now. She pays me £12.50 (I teach her languages) but it's reached the point where I don't think I can do much more for her, and the money I get is not worth my time. I tried to set her up with a friend, but my friend couldn't do it. I've tried to find her a replacement, but so far no joy. I genuinely just had enough, but I don't know how to "break up" with her in the kindest of ways