My friend is mean is it normal

Well my friend always calls me big butt and tells me she has smaller hips that she has smaller hips That she is prettier and that when I push her on the swing she yells at me saying YOU'RE TO SLOW I COULD DO BETTER she told my crush plus secrets and the popular girls there not in our class so at recess she ditches me for them and when I hang out with my real friends she says I need weirdo rehab and sometimes I feel like bursting out into Tears she is mean to my real friends and when shes not with them she plays with me and she says do you know what i have done for you!!! what should I do !!!!!!