This girl is in year 9 and I'm in year 13 and that is definitely dodgy. But I think she does like me. She'd follow me around and she touches me a lot and weirdly she brought up sexual topics with me but it could be friendly think. The thing is she said she wanted my number at the end of the year which I'm kind of hesitating because she'll change in those years and I don't really want to see her having a bf. To be honest if she were in my year or below I would've dated her already but she isn't. What should I do get her number and wait or walk away?