I had a friend who used to keep borrowing money from me. I thought it was because she needed to buy food but it turned out she was buying alcohol for herself. It became a real liability because she would also keep asking me to look after her kids probably so she could sleep it off. She hid her drinking really well at first but after she turned up at the school drunk I realized. I had to say something. She cut herself off from me completely and I heard she had her kids taken away. She has tried to befriend me again but I don't think it's a good idea until she gets help. She still won't admit she has a problem by all accounts.