Is it normal to still fancy my HS crush even though I'm in a relationship?

He's on my FB list but we rarely ever chat and the last time was just about recipes. Even though we're 27 year-olds by now and in our own relationships, I still feel attracted towards him and he's still has his good traits that made me like him more back then. We never dated though. He liked someone else.

I know I'm in a relationship but is it normal to still fancy my old HS crush?

Is it normal to still fancy my HS crush even though I'm in a relationship?
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