I have a friend she is very hot n y but i hurt her much bcos she talks wit al gys btguys think bad of her?

i have a friend she is very hot n y.i love her. even she knows. bt she already has boy friend.but i then to care of her. i have seen her many times with her bos he will be puting hand on her waist and rubing,touching her and he drops her to her house.and if i give any tng she dst take but ifsome one else gives anything she takes and haves it.plz sugest me plzzzzzzzzzzzzzzzzz