Why is my best friend so overprotective?

Anonymous
One of my male friends gets extremely overprotective of me. He freaks out about every guy from the one who I'm only talking to because I have a project, to the guy that flirts with me just for kicks and giggles, to the guy that I literally call my brother (even though he is not). He keeps telling me that he just doesn't want me to get hurt, but he knows that I'm perfectly capable of taking care of myself. When he does see me talking to a guy, he comes over and makes an excuse to pull me into another conversation. I admit, it's kinda cute in a way, but horribly frustrating. What gives?
Why is my best friend so overprotective?
3 Opinion