He keeps poking me?

Me and this guy at work are good friends, today I came to work in my normal clothes and hair down. It was the first time he has seen me with my hair down and in nice clothes any way I went to work later that day and he was acting different when I was singing in he was walking down the stairs I say hi and he said it back then he stood behind me really close and begun poking My waist he keept doing it it felt different he has never been that close and we where alone does he like me?
He keeps poking me?
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