Dear Eric: I’m close friends with one of my sisters-in-law but not the other, Betty. Betty and I used to be close until jealousy came between us. She was jealous that her brother and I were the first to get married, have kids and reach other milestones. She is also very sensitive, so I’ve felt like I need to walk on eggshells, especially after she confided to my husband that she thinks I complain too much. In short, I don’t feel like I can share my joys or my struggles with her.