Chelsea is your personal enemy at your school luckily she doesn't do stuff publicly but that is mostly because you are her property.

She has a mixed behaviours around you one time she chats to you and shares food, etc and then there are times she uses you for attention and distraction making how you 2 stand with eachother odd. People around you genuinely think you 2 are either a couple which she disagrees with heavily, no she actually makes you do things only couples would do just to lead you on amd get satissfaction from it.