Outgoing guy suddenly awkward around me?

Anonymous
I'm not that pretty, but I can say that I am more intellectual than the girls in my friend group. But I'm shy. I look down when I laugh because I don't like people seeing my smile. And I find it extremely difficult to maintain eye contact.

This guy is attractive, 8 years older than me, and is very outgoing. He loves talking, and he will talk with everybody in a room, and talked to me alone for hours when we first met. He added me on Facebook and has been talking to me continuously. We have a lot of fun talking on there. And then I saw him again, and this time he kept glimpsing over at me while he was talking with another girl (who is beautiful, outgoing, and more talkative than him). But when I sat beside him to try talking to him, I sensed that he felt really awkward, and he seemed to be having a hard time thinking of a conversation topic (as was I). But he's a great conversationalist usually.

Now what I'm confused about: he can easily talk with other girls and he seems to have a lot of fun speaking to them. He teases them and can talk for a long time with them. We were hanging out at a park with our mutual friend group, and he would ask the other girls if they wanted to go on the teeter totter with him (yeah, cause that's the sort of mature thing we do), and he went on it with another girl who likes him and they were laughing and teasing each other as I just kinda awkwardly sat there and watched. When we hung out again yesterday I thought I had completely destroyed our chances because I was so awkward around him and couldn't talk the way I spoke to him on Facebook.

He wrote me on Facebook again this morning to start a conversation again and told me he had a great time yesterday hanging out with us.

Did he sense my awkwardness too, and just didn't feel like speaking with me when we met again? And why is he shy with me all of a sudden? When he's talking with our friend group, he can keep eye contact with everyone else in the group, but can only look at me for a second before looking at someone else again.
Outgoing guy suddenly awkward around me?
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