How do I get rid of these feelings?

I'm 37. I thought that I was past the silly crush phase up until 4 months ago. I developed a crush on a coworker. It seemed he liked me too because of him going out of his way to talk to me and saying my name a lot. I gave him chocolate and a small gift and afterwards, I noticed that he is avoiding me since. Twice he was walking my direction until he saw me and hurried in another direction to avoid me. I don't want to have feelings for him anymore. I haven't had a crush like this since high school. He works in a different dept so I don't have to talk to him for work purposes. Will just totally ignoring him work to kill my feelings?

How do I get rid of these feelings?
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