Everyone knows the feeling of butterflies in the stomach, pleasant nervousness and thinking about a new acquaintance with whom we felt chemistry. When we are single, we are usually happy with a new crush and think about how to find out if the crush likes us too, but when we are in a relationship, our feelings are a little different. Many times when we fall in love, we are met with guilt and the feeling that we are doing something wrong. That's why we asked the experts: Is it normal to have a crush when we're in a relationship?