I, too have my own share of those. The first time I was hurt was when I was in 5th grade and I was absent for days. Friend 1 called me and told me Friend 2 said lots of hurtful things about me when I wasn't around, saying, "The only reason why I have friends is because I bought them. (Buying them food, etc.) Actually, I'm not BUYING them. I'm just happy seeing them happy. And I don't like to eat when people around me are not. So I tend to buy stuff for them too.
After that I was completely hurt and didn't trust friends anymore. I used to be so kind to everyone. Allowing them to step all over me. Now I'm in high school and I just don't want that anymore.
I stood up for myself. Protecting myself from getting hurt and my new friends, I still have them but I kept my guard up. I don't really want to get hurt anymore. It's time to protect myself from unwanted friends.