In the new Smurf movie, Smurfette and Gargamel vaguely mention that Smurfette betrayed Gargamel and that Gargamel especially wants to capture Smurfette out of all of the Smurfs. You might think that it is just because Smurfette is the only girl (which she isn’t really).
In actuality, it is because Gargamel created Smurfette and then she turned against him. The Smurfette that Gargamel created wasn’t the sweet, blonde Smurfette that we all know today.
Want to know more? Check out our post Why is Smurfette the Only Girl for the whole story plus the original Smurf cartoon that explained it.