Well she doesn't have the luxury of exiling him at present so she doesn't know how that helps. She supposes it corroborates the gut feeling she got about him, that he's off-limits. Possibly for both their sakes.

"I can't, because that would make you the world's biggest asshole." After the words have left her mouth, the dots finally connect. The petals are for the tea. And the tea has to be related to this whole bonkers mess or else, yeah, world's biggest so on and so forth. Jess eyeballs the cup like it's lined with poison or filled with... eyeballs. "Jesus Christ, you're serious. Tea?" As the solution to moths. If that's how it works, she's done. She hates everything and she's done.