We talk online but not in real life at school? help?

This guy started talking to me a month or so ago on facebook, he’s in a younger grade and we go to the same school but we've never spoken in real life. We talk every day and I really enjoy talking to him. Recently I found out he just got a girlfriend and it really hurt me that he didn't even tell me, I saw them together in school. I said to him "I didn't know you had a girlfriend?" and he said "surprise". He does say that I’m cute, funny and cool and we talk about almost everything. I see him at school and pass him sometimes but we've never talked. We say we’re just friends but I'm not sure. He says stuff like "I care for you", "you make me happy" and "I don t want other people, I want you and I’d miss you if we stopped talking". I’m very confused, is he using me? I'm also scared to talk to him in real life, he said that he’d say hi first but he hasn’t. I don't know what to do, I told him that it makes me uncomfortable talking to a guy that has a girlfriend and he just said "why? We’re friends". I tried to tell him that maybe we shouldn’t be friends anymore but he just kept disagreeing. I think he’s a genuine person; we have the same music tastes and same beliefs. I get along with him really well. I just don’t know what to do.
We talk online but not in real life at school? help?
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