The Side effects of Fangirling

Woah...

In case you didn't get the gist:

·Garnet touches Sapphire's gem
·She adjusts her glasses like she does when she's nervous
·She touches Greg with said gem.
·Greg tears up.

What did she show Greg? Is it Rose? Or is it Steven defeating Yellow D?

Also, off topic, but Ocean Town is a real city in Maryland. It's located in the Delmarva peninsula, the same peninsula that's a state in Steven's Universe.

What really happened to Ocean Town? Does anybody other than me know why it's called delmarva? Why is Garnet so cool?

Garnet:You'll sooner die than find out.