This is not a murder suicide based on "survival" this is a murder suicide based on the lost relationship. Clearly this boy was distraught over the break up, he kept up a good front of "willing" to just be friends. He picked a spot where he knew they would not be spotted for sometime and then took her life then followed with taking his.  Just being lost does not warrant this kind of action, nor the carrying of the gun with the BS sham comment of "protecting her" The loss for both families is sad, but make no mistake this was a calculated and planned action by the male. Nevertheless it is sad, but we need to stop making fantasized excuses of some heroic action that by the outcome dictates otherwise. 

With the amount of boots on the ground, mere cries foe help would have brought them face to face with rescue personnel. This guy could not have this woman and so no one was going to be with her...end of story.