Having a difficult relationship with a guy, what can I do?

Ok, so basically I'm 16, male and I'm bisexual. I came out to my two best friends a month ago. They were really supportive so I decided to tell my 4 other friends too, 3 girls and a guy (let's call him S). Since the start of the year I have been having feelings for S and I now believe I am in love with him. I think about him all the time, when I see him I get really happy and I never stop thinking about him. He is very attractive but it's his personality that I love, he is sweet and sensitive not like all the other guys I have met unfortunately. I really do love him, but there are a lot of problems with it. First of all, he is presumably straight and his girl friend is my best friend, who i love like she is my sister. Therefore, I doubt I would ever have a chance with him. Secondly, because I spent all my time 'obsessing' over him, my schoolwork is being affected and I have lost any motivation to work hard recently, I just want to sit and think about him forever. Thirdly, my emotions are getting out of hand. S sits next to my other best friend in some lessons and he tells her that "he sees her like a best friend now" and I get really jealous. Why can't S tell me that? I try to get closer to him, but he never really pays me much attention, which annoys me because I feel lonely that I'm losing him and my best friends. I really want to get him out of my head, but I cannot. I just get depressed if I think I'm getting rid of him, he just messes with my head so much it's surreal, I have lost a lot of focus and happiness because of him but it's too hard to let him go. It's really tearing me apart. What can I do?

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