Why Is He Quiet When We're Alone?

raexcvii
He's the kind of person who's always joking. He's fun to be around, and pretty freaking amazing.
We're close friends, we text all the time. He talks a lot when we're with our friends. We joke with each other and talk so freaking much when they're there. We like each other and we both know that but we aren't in a relationship (for various temporary reasons... and no he doesn't have a girlfriend. Actually he's never been in a relationship). Our best friend purposely left us alone today so we'd be alone together. We were really quiet, he was so quiet. I even told him "I've never seen you so quiet" he nodded. He only nodded and didn't say anything. I tried breaking the ice but it was useless and he wasn't sad or mad because he would tell me, he always comes to me when he's not feeling well. It's driving me crazy. I'm sure I didn't say nor done anything wrong. He opened up about something that happened in the past but that was about it. I tried lighting up the mood and talking about anything but it was no use, he only would look at his hands and play with them. Then we took some pics and I made him laugh a couple of times. When a friend joined us he was back to his usual self. It drove me crazy. When he'd sit alone with another friend (a girl) from our group he'd act normal but when he's alone with me suddenly he's quiet. I felt like I was boring him, and/or there's something wrong with me.
Why Is He Quiet When We're Alone?
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