Via Wikepedia:

The music video was directed by Declan Whitebloom. The music video was first leaked on September 7, 2008, through AOL, initially restricted to Canada and then released on September 16, 2008, on iTunes. The video now has over 30 million hits on YouTube.

It consists of Archuleta on a vacation trying to get the attention of a girl (played by Hagood Coxe) on whom he apparently has a crush. At the beginning, several teens go swimming in the lake near their summer house, with one of the guys flirting with the girl in the water. After they have finished swimming, the guy runs off, while Archuleta stays behind to help the girl out of the lake.

The group is also shown in a cabin playing a game involving post its, while Archuleta is also shown playing his guitar in the cabin. Another scene shows the group by a campfire with several of them paired off into couples. At the end, Archuleta goes out on the deck of the cabin, and the girl follows him out, showing that she shares his feelings. Archuleta is also shown playing the piano near a lake throughout the video.

Gifs credit: @samlouiseG

Thanks to FOD for the post!