being left by someone u love is really a terrible event that could happen to anyone especially if u feel that he's the one thingy..and i just experienced that recently (no crying now!)..what i did is help myself..pray and go out a lot with supportive friends..i got a book the secret by rhonda byrnes and i read it again and just be positive in every aspect ..there came a time when i hate to see couples, i hated music and hated men..but hey its not the end of the world..tell ur friend that he is not the last man standing on earth..its really easy to say but let her understand that she must know when the story is over, she must accept that people really change (and cheat for that matter) and most of all, just be thankful that he has been a part of her life and start picking up the pieces..learn, live and laugh..time heals all wounds and yes it will..