Should I stop? Please Help!?

Well I'm in 6th grade. I used to date this guy named Cameron, I had only dreamed of him and me dating but it didn't last. He dumped me in a day over text. Well he sits next to me in Science and we have been getting closer and closer... The first day just our legs interlocked, the next day he held my hand as our legs were interlocked. I was in total shock I was breathing weird and was like frozen. The third day he starts rubbing my leg but nothing inappropriate we are in 6th grade. I'm not comfortable with him doing this because he has a girlfriend! And I don't want her to find out and be all like b**** what the hell is your problem?!?!? And after school he try's to avoid me and docent text me... It hurts alot, is he just using me. Tell me what I should do. I'm very shy and every time I look at his hazel green eyes it feels like my heart is in my stomach. But he's a huge player! And I don't want him or Sammy to hate me >_< UGH! please help and no rude comments pweeze *\(^.^)/*