Friends or more?

Hi everyone! I’d love your advice and wisdom. I lived with a guy in college for a summer and developed a friendship with him. Both guitar players, we would occasionally play music together. He was dating a girl at the time, graduated, and subsequently moved to another city to pursue a music career. We stayed in touch for a couple years and in a phase of travel, I went to visit him for a couple days. When we lived together, we were always strictly just friends and I instinctively knew we both felt that way . However, during my visit to see him for the first time since college, I couldn’t help but feel that something might have shifted. I perceived several “moments” that for the first time seemed like it was more significant than our old college roommate dynamic. There was one point playing guitar together where I opened my eyes to find him staring at me really intensely/ deeply. Immediately after that he got really quiet for the rest of the day and the entire mood shifted. I couldn’t help but think it may have been a “moment”. Since then, he’s been back to my city Several times and has always made an effort to see me/catch up, play music etc. We always have good conversation, he seems to remember a lot about me, and sometimes it just seems like he looks at me a certain way. But I’m not sure if it’s all in my head… sometimes when I try to be more emotionally vulnerable about our friendship (ie: telling him how proud I am of his music and how much I appreciate him/learn from him) he deflects/ becomes kind of stone walled and doesn’t reciprocate the sentiment which makes me feel shitty. I just can’t make sense of our dynamic and whether or not there are feelings below the surface or if he finds me annoying? Maybe I’m reading into things too much. Thanks!