Alfie Is A Spy And Here's Why..........
I can't stand Alfie. His character is smarmy. You can't quite believe if he's being truthful about what he says. I love how he conveniently shows up in her French class. Yup, he's a spy alright.
I think Camille's mother is the one who actually hired Alfie to spy on Emily and Gabriel and his "assignment" was to lure Emily away from Gabriel so that he would go back to Camille.
At the nightclub it looked like he was innocently asking Gabriel all of those questions about his relationship or stance towards Emily BUT he was really just to pump him for information so that he could let the mother know whether or not Gabriel and Emily were really just friends. His mission seems to be complete and so that is why he "suddenly" has to go back home. That info lead Camille to feel confident enough that Gabriel wasn't into Emily anymore....
Having said that, we all know they love each other....