Let's think about this for a minute. The other girl who likes your classmate always talks to him, but you don't. So he's getting to know her and feels comfortable around her while you're just watching them from a distance. If you want to start a friendship with him, you have to start talking with him.
Will a relationship develop and will you both fall madly in love? That's impossible to predict. But one thing is certain. You have no chance of a future together if you don't make an effort to get some conversations started.