I think I should stop this feelings I have for that guy

I'm a college student, and I've never been in a serious relationship before. I don't usually have crushes (except for celebrities). I don't usually get attracted to or fall for someone easily. Last year, we started having face-to-face classes. I was attracted to several guys just for their smarts and brightness, but that kind of attraction—I don't feel any butterflies in my stomach or something like that kind of emotion when you're having a crush. But I was just attracted to them for a short period of time like that. But as I was so focused on my studies, there's this guy that I've encountered at the campus since last year. I was not sure at that time if I was attracted to him. My mind at that time was only occupied with studies, and I was attracted to someone else at that time, but I never shared it with my friends because it was just a slight attraction.

There are times that our eyes met, but I never really cared that our eyes met a lot of times. I wasn't even thinking that I had a crush on him. But, I felt a kind of feeling like I was happy to see him, like when our eyes met or when I saw him at school, I felt like it brightened my day. I never even had an interest in knowing his name at that time. I never told anyone about it at that time. I just thought that this person made my day better just by seeing him.

Then, now that it is my last school year in university, I realized that I did have a crush on him. I already knew his name; I did tell my friends about him, but I never used the term crush," but they said that I really have feelings for that guy. For me, I don't think so. I was just happy whenever I saw him.

Actually, now I know that he is unavailable, and I don't want to have a crush on someone who is already taken. Even though he doesn't know me. I was just admiring him from afar. But I was hoping these feelings I have for him would eventually fade.