Ironically, the laugh shouldn't have helped, but it did. A little.

Not enough to completely take the sting out of 'make up our minds for us'. He knew he wasn't going to get an outright denial about how Finn felt about Rey, but--

He couldn't help but wonder, how they would have made up their minds if he hadn't brought it up first.

Couldn't help but wonder if he was even going to be party to that conversation.

"I'm not that suicidal," He said, trying to smile and failing. "Not going to tell a Jedi what to do." Even that weak smile faded, and his face set. "... I'm serious, Finn," he said finally. "You were right. I don't-- You don't know what happened to my father, after my mom died. I don't want to do that to anyone. Rey... Rey can take care of herself."

And you, he didn't say.