I know the show is edited, but if Chantal is his F1 why in the previews showing images from the FRC we hear Brad say "I hope she loves me back, if not I'm lost" (or something in that respect). He already knows Chantal loves him!
Based on the chemistry it looks like Chantal is the F1.
The thing with Emily is that Brad does not have control of their relationship and he seems scared of that. With Chantal he can play his lead part...at least for what we can see.
As for the F1, I still hope to be surprised by the ending!