Why does this one girl stand out to me?

maybe you're in love. who knows? Life is full of surprises. Why don't you get to know her better and see if it is love? You still need to talk to her even if she's taken. I'm not saying communicate with her at any and every possible moment. But treat her like a friend. If you don't, you two will inevitably grow distant with each other and you might never get to have a chance to find out what it is exactly you feel towards her.