Yes, chemistry, emotional connection, deep attachment, and I would add feelings of excitement/romance, and wanting to place the other person's happiness as a priority. When we're in love, we feel we would do anything for another's happiness and well being. We go above and beyond for the person we love. We go out of our way and we are generous with the person we love... there's a sense of placing an equal value to that person as we have for ourselves. Meaning, our own happiness is very important, but the person we love's happiness is just as important, and sometimes, can even be more important to us when we're in love. When you're in love, there's also a feeling of walking on cloud 9, where everything just feels right in the world and you want to scream it from the top of the roofs. That's the feeling of being in love. It may not always feel this way, but generally speaking, that's how being in love should feel, imo.