Maybe he really does like you(in all seriousness). He's clearly nervous when around only you.
Just try to get to know him better. Have a good time, hang out at work, school, etc.
He's clearly shy(I can relate) and thus won't open up right away, or maybe even never. If so, he's still a good friend.
Quote:
My obliviousness combined with wanting to be friends with guys usually ends up in disaster.
For me it's the opposite: my obliviousness combined with wanting to be friends with girls usually ends up in disaster.
Just be his friend at the end of the day. No harm done.