I like someone at work but I know he's not interested in me. How do I forget him?

I was working in a place where there were a lot of women. We had a full chat in one and he told me his whole personal life. I know he is older than me. I wrote here too and you said he was just being polite. I said oh then I misunderstood and continued. But yesterday we were in the same class again and we had a little chat. He remembered my name which is a big deal for me because the women I worked in her class pretended not to know my name. I know he is still a kind person but I started to like him... how will I forget him? Monday is my last day of work by the way

I like someone at work but I know he's not interested in me. How do I forget him?
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