I think I have a huge crush on my boyfriend's friend.
That's bad. Why do you have a crush on him?
It was love at first sight, I just couldn't take my eyes off him
You shouldn't have crushes on your boyfriend's friends. He loves you. That is a form of cheating.
Maybe it is not a crush, maybe I'm just jealous of him since my boyfriend doesn't pay attention to me.
Maybe but you should find out for sure. Otherwise it would be like you are cheating on your boyfriend. If you are having problems with him, it will not get better if you cheat on him.