I can't understand his true intentions..

It all began when we were introduced via facebook through my brother. I messaged him first and he texted back with lots of smileys and with very bubbly enthusiasm. He seemed more than excited to meet up. However when we did meet the 1st time ever, he couldn't even look at me, he never even spoke to me. He'd only reply briefly to a question I'd ask every now and then. Then later on as the days went by and we met up more frequently (not on dates, but he stayed at my brother place on vacation), he became more relaxed and was able to look at me and initiate brief convo. Later he'd always go to his room and he'd stay there like he always usually does. Next, I tried appearing more physically appealing when we went out. If anything, it didn't change his behavior one bit. He never stared, and always walked 5 steps away from us. (a brief note: his 3 siblings have told me how he was always the shy quiet child playing alone when they were kids. They said he had a shell and it needed time to break down. And he's only ever had 1 girlfriend his entire life, that too was because the girl begged him, they say) So then he left back to his home town and I tried to occasionally keep in touch through fb. He'd be nice with smiley faces and a few sentences, but whenever I felt he was comfortable enough with me and I tried asking simple things to get to know him as a person like hobbies and things, he wouldn't reply and he'd just ignore my messages. I thought to myself, 'I'm always the one initiating and no matter what I do, he won't open up. I give up. he's not interested'. Then months later, just last night I saw him online on fb and I said hi. He was happy to hear from me (as always when he talks) and asked me many questions about my uni. He made the effort to keep the conversation going. Basically, I don't know what's going on. A big part of me tells me he's not interested. but if that's the case, why does he even bother having a conversation anyway? What was different about last night's conversation was whenever he says he has to go somewhere mid-conversation, he leaves and never follows up. but last night, he actually followed up. SOMEONE PLEASE tell me what on earth is going on inside his head???

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