If a boy touches your bum does it mean he likes you?

shaunaxoxo
recently I told my crush I liked him , then he touched my bum. At first I was a bit shocked so I laughed it off and playfully pushed his hands away. Also when his hugging me, he likes to put his hands on my bum and he doesn't do this to other girls. And in maths the other day I was getting a book and I couldn't reach so he came up behind me, put one hand on my bum and got the book for me. Plus I overheard him calling me pretty the other day as well, does this mean his interested?
If a boy touches your bum does it mean he likes you?
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