Can you tell me when Lindsay and Cameron sing Baby,It's Cold Outside something has shocked,isn't it.When they finish video shooting Cameron look a little nervous and called his mother why?

Here's what happened:

At the end of 'Baby, It's Cold Outside', Lindsay kissed Cameron. Cameron was upset because he has a girlfriend. Since he's a Christian, he felt like he committed a sin(which is that you shouldn't cheat). So he called his mom telling her that he felt like he cheated on his girlfriend.

Because he is a Christian and he was also in a relationship at the time. When Lindsay kissed him at the end, he didn't want to and it was a surprise. He felt like he had cheated on his current girlfriend.

Lindsay saw Marissa kiss Samuel, and decided that she needed to bring her game up a little. So at the end of the video, Lindsay had kissed Cameron. He said it was very unexpected, and called his mother. He explained to her that he felt like he cheated on his girlfriend.

And also, he quit The Glee Project later on because he was to kiss Hannah, and he didn't want to risk his relationship with his girlfriend back at home. But the upside is that he saved Damian from elimination, so...