You had always wished to be home, instead of at this journey since it started. Boromir had just died. You saw Sam running after something. And you decide to follow him. You saw him trying to catch up with Frodo, and he had jumped into the water, and almost drowned, cause he couldnt swim. And Frodo had pulled him up on the boat.

You look at them. And then decide to ask.

"You can't come." Frodo says.