There are thousands of different quizzes online that are designed to "tell if a guy likes you," including Seventeen Magazine's test titled "How Do You Know if a Guy Likes You" and Cosmopolitan's "Are You in Love or Forcing It?" test that lets girls know if the guy truly loves them or not. Another quiz would be Marie Clarie Magazine's "Is He the One" quiz, which is geared more towards couples.
There are other quizzes available from bloggers and other magazines with relationship sections. There are also other quizzes that deal with different aspects of the relationship such as "Is he your type?" or "Does your guy flirt too much?"