Summertime Friend
A summertime friend is someone who comes around sometimes. They only need you when you are doing something for them. They are not true friends and do not serve a purpose in your life. In fact, they are probably toxic people who do not need to be in your life.
Katherine is a summertime friend because I stopped giving her free items from my shop. She is now best friends with someone else who she is using just as she did me.