Friend and dad were unsympathetic A holes
It would be very traumatic for one to watch their lover fall to their death.
That person might have PTSD and would need to get professional help from a shrink to help them get past it and they would need the space to heal from the grieving as long as it takes.
They were like, "Get over it already! Hey, I know what you need! Let's go climbing up a high and unstable tower! That will help you get over it. Right?"
Now the poor girl will have even more to recover from that she may never do.