I have a "friend" who kinda hates me. And I kinda hate her. The problem is that she always hangs out with my friends. Like, always. Whenever I say something, she makes some sort of rude comment. It's really annoying so I decided to ask why she hates me. Her answer? "Because you hate me." I explained that I disliked her because I thought she hated me. We started laughing and soon, we couldn't believe we disliked each other. We were friends from then on.
Moral of story: Sometimes, the person who you thinks hates you, hates you because they thought you hate them.