I recently dated a guy who seemed to agree with everything I said, even if 1 minute before he had said the opposite. When asked about it, he always said that my answer made him think again and that he actually agreed with me. I find this lack of personality, or insecurity, quite icky. It was one of the reasons why I stopped seeing him.
Now I'm curious, what gives you the ick when dating someone? Something that would lead you to stop seeing them.