At that time Dexter actually wanted to go to Canada, to catch up with Stella. Because he really misses the woman he loves but Carolina is always here making excuses for Dexter to stay and not leave her.
Dexter, he was really annoyed. But he didn't know how to react to Carolina's attitude, which made him really angry. He really just wanted to ignore the Carolina. But in fact Carolina did something that seemed to have worried Dexter.
So he didn't know that Carolina would do something like this, and keep Dexter from going to Canada. Dexter was feeling disorganized, because Carolina kept forcing him to be with him all the time. And he, Carolina also didn't want that Dexter to go anywhere, without Carolina herself.