Romantic Comedy?
There is nothing romantic about one night stands or philandering, disloyal pigs.
There was also not a single joke made in this movie. In fact, nothing I personally found remotely comedic except the single cheesy scene at the ex boyfriend's home.
And to wrap it up, there is nothing romantic about leaving one person to be with the person you cheated on them with. Alternately, there is little romance to be found in the stupidity that comes with allowing someone to leave their girlfriend for you, as their mistress, so to speak.
My opinion is my opinion, but I'd love to hear a single good reason to call this a romantic comedy. If I had any money, I'd even put up a $50 reward for one.