Do I have a chance with him?

I noticed a guy at my college’s gym who I would see all the time. I smiled at him and he said hi, and the next day, he initiated a conversation with me. We would see each other there a couple days a week and talk for about 20 minutes. He’s 28, a grad student, and I’m 19. He SEEMED to show a lot of interest in me, he would remember EVERYTHING I told him, he would always ask me how my midterms or papers went, and he would look at me for a long time and smile and laugh at everything I said. This went on for several weeks, but he never asked me for my number. School ended, so I added him on Facebook and messaged him. We messaged for about a month, then I casually brought up hiking because it was something he showed interest in. I said that I always wanted to go but could never find anyone willing to go with me, hint hint. He never replied after this! Should I talk to him if I see him when school starts or is he not into me? I developed really strong feelings for him