Find out about his interest; find out what may be common between you, try to understand what kind of girls he likes. Gradually change yourself for it. However, it should make inquiries to ensure that he does not have a girl, as this is a significant barrier. Especially if they have long-term relationships and serious.
If you have the opportunity to become better acquainted with his acquaintances or friends, it is time to use it. Perhaps you will attend, along with his company any event, thus spend more time with him and gradually fall in love it in yourself. But at the same time gently behave with his friends, as if somebody of them want to meet you, your object sighs unlikely to spoil relations with a friend and go to conflict.
Always watch your appearance: you have to look perfect. Remove from the wardrobe of baggy clothes and gray dress. Try to be visible, to stand out among the rest. Let all the guys pay attention to you, then you definitely will have a chance of getting heart impressive loved.
Analyze his behavior, but note that it may just be shy and only so do not be against you visual senses. Probably, he had a crush on you, but hesitates to admit it. Try to stay alone with him and drop him a hint that you like it. Look at his reaction and, most likely, your problem will be solved.