I’m 20 years old, and I live with my mom and stepfather when I’m not in college. My mom is unhappy in her marriage and frequently complains to me about it. This makes me very uncomfortable and sad, so I asked her to stop doing it. She said that I’m being selfish for not wanting to support and listen to her. Am I being selfish, or is she? Am I supposed to act like her other female friends now that I’m an adult, or are there still some boundaries that shouldn’t be crossed?