What are the signs that a guy is pretending to like you?

This guy knows that I like him. He use to like me A LOT. He was very into me. Now were just friends. He never admitted that he didn't like me but he won't admit that he does. I text him and tell him that he doesn't like me he says this: O OK, O alright, or Glad to know you know everything. Then I would ask him if he likes me he says: "I don't want to talk about it or I'll tell you later." Then I text him you know you love me just to see how he would react to it and he texted this: "Sure." He always text me all day long. When I call him he answers immediately. What is up with him?
What are the signs that a guy is pretending to like you?
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