Why is this guy ignoring me?

Anonymous
A guy at work I like ignore me at times but shows interest... I already told him I had a crush on him. He flirted back and didn't deny with another coworker he wasn't flirting with me. For example, I walked straight passed him and ignored him and he didn't say anything. So later, that night I text him like... Hey, I didn't see you and he replied... and we talked about work and relationship and he still ignores me and avoid me totally after I told him I had a crush. Whats going on?
Why is this guy ignoring me?
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