I might have a crush on him again

So when I was like 13 I had a huge crush on this guy and he was my first love but things didn't go very well.. Then we stopped talking to each other and we lost sight of each other because high school and other stuff happened .. Now, after six years I saw him again and I realized that I still like him very much and I don't want to?? I mean when I saw him I started feel these funny feelings but I really don't want to because I know that this thing between us is never going to happen or work