The ending song is "Extreme Ways" by "Moby" and the alternate ending song is "In the Sun" by "Joseph Arthur" You can listen to both of them on youtube to be sure which one you are searching for.
"Extreme Ways" By Moby
The song is called When I Look @ You , it is a really beautiful song!
If I remember correctly then I believe the song that was played in the trailer is: "When I Look At You" by Miley Cyrus
Shut up stupid, her and Jason switched seats! ZOMG!!!