You should talk to him, initiate the conversation, and carry it if necessary if you want progress. Stop asking us how his mind works, we don't know. You need to talk to him to get to know him. That's how you find out how his mind works.
Or you can simply believe all the myths your friends will feed you, and be perpetually unhappy and lost.
Pick one.
Or, you are simply not his "type".
We also had this one moment on the dock when the sun was just going down, we didn't talk we just sat there for ages.
Or, he doesn't know you like him because you never told him. And when you ARE together, you don't talk to him. You gave him the cold shoulder.
I have a long time interest in psychology, specializing in relationship dynamics for 30 years.
(Please note, we give the best advice we can based on the information given in a post. For better advice, please include the age of all romantic partners.)