What is happening in Star and Marco are doing?

After they escaped from other dimension, they argue about she wants to explore for rare things in anywhere dimensions. But he looks there are much monsters come to trap them. That is bad idea. In Earth, Star and Marco leave separately to their opposite bedrooms. Later that night, they come to apologize together because they think to hurt her or him from the argument. This is happening in they apologize over and over again from hurt or angry feelings with their friendships.