What do you think a real friend is?

When I started my senior year at school I didn’t have any friends. As the days went by there was a group of girls that asked to be my friend. I told them yes and started eating lunch and doing other things with them. So a few days passed and I started to realize that they were not associating with me as much as they used to. So, one day I was about to sit and eat lunch with them and one of them moved their purse on where I was about to sit. The whole group started talking about how much they played me and how they were never my friends in the first place. I cried all that week and felt so stupid and humiliated and now I know that I need to learn what a real friend is! Can you help me?