To girls:my bffs r taking behind my back so much and leaving me left out wht shuld i do?

sometimes my bff r so rude and sefish and mean.this girl named jordyn she was one of them and all the attention and spotlights r always on her and not anyone else she stole things frum my desk too u i am so not lieing she emptyed my purell,stole half my sticky notes,and took other school supplieso f mine i need revenge cause i hate hur now she is so mean now!!!give me advice on to get revenge on her.i hate jordyn!!!!!