Damn....
best way to fix it is to glue or epoxy it. Then grind into the crack line a bit to make s small trough, and use a filler to fair it in. That sucks man....
It can be salvaged. Try two part epoxy to join the pieces and reniforce the inside with a few layers of fiberglass resin and fiberglass mat. Then try glazing putty to smooth the seam on the exterior.
Give it a few days to think about it, you've gone to far to quit.