At the beginning of the school year, I decided to reach out to a boy, someone I have known for two year nows, and suggested we should start talking more since we both had chemistry together. We would flirt every now and then, talk to God knows when o'clock at night and even joke around at school. This lasted for a month and a half, now I can't even get him to response to me anymore--he leaves all my messages on read and makes small talk with me before ignoring me in person. I've tried to see if I did something wrong or if something had happened, but he won't answer the question. What should I do?