1. They are empathetic with you
When something happens to you and you tell them, they are not just sympathetic, but empathetic as well. This means that they will try to understand you on a deeper level and they imagine themselves in your place.
According to Dr. Suzana E. Flores, a clinical psychologist, someone that is secretly in love with you will care a lot about your feelings and your general well-being. With that being said, if you were doubting that a person might like you more than you think, pay attention to their reaction the next time you are telling them something that has happened to you.