Yes she is going to be very very resentful.......

I dont think talking to the teenager will do anygood as I really have no way of knowing if they will continue being friends behind my back, I also know somone else has tried talking to her but got no where, but I am holding off on going to the parents as I dont want to over react, however if I do nothing and somthing happens I will never ever forgive myself.

I am so upset by all of this.