Why did my friend tell me he had feelings for me and then get a girlfriend a month later?

He told me when he was drunk, and I don't know if he remembers. I told him we could talk about it when we were sober, but then he didn't bring it up again. Now he has a girlfriend and they're getting serious. Why did he do this to me?

Why did my friend tell me he had feelings for me and then get a girlfriend a month later?
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