In fact, Dexter was really worried about the safety of Stella and her family. Because he knows if Stella is a woman he truly cares for and loves. Therefore, he tries to be a husband who can really make Carolina not hold a grudge against Stella and her family.
Because Dexter really couldn't let it happen. Like long ago, when Dexter was actually only forced to marry Carolina, and nothing more. Actually Dexter is, he's just trying to be a good father and also a good husband. But sometimes it was here that he couldn't really make himself useful for Immanuel, his family.
Even if it was Dexter, he really needed Immanuel to help him work for his company. But he couldn't stop Carolina either, if she was going to try to harm Stella and her family. For some reason it was Dexter that he didn't want Stella to be in a bad condition, and moreover, his safety was threatened.