In terms of gossip, magazines and all that crap it's obvious Justin Bieber helped her get her name out there more but that doesn't mean it's what made people buy and actually want to listen to her music. If that were the case why is Justin's ex Jasmine Vagina flopping like no tomorrow and giving her albums for free?
Selena's success musically came from people actually loving her songs. Either way, her albums are selling the same as they did before she started dating Justin so that argument is irrelevant. Y'all gotta admit though that Love You Like a Love Song was one of the best songs released in 2011. It's still slaying on iTunes and radio after 7 months.