Why would he lie about his feelings?

If a guy showed all the time that he likes me through his actions for around 2 years and when I asked him about how he feels and he says he likes me as a friend but doesn't deny the question. His friends tried pushing him into me and teased him from time to time about me when I was around him. But why would he lie and will he ever work up the courage to ask me out?
Why would he lie about his feelings?
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