Sam doesn't have answer, so he doesn't answer the question. He doesn't want to think about it for very long, as it is, so instead he looks out into the ocean with Higgs.

There were plenty of people he could have told. But Sam didn't.

"Why don't you act anything like you did the last few times we met?"

The question probably isn't entirely fair, considering he can still tell Higgs is Higgs, but he's still... very different in a way Sam is starting to find a little unsettling.