The first one: It's the music in the movie "She's the man" where Duke and Viola talked about love and girls, she begins when Viola tells that Duke can trust her.
The second one: Well, I'm trying to find a music to my situation. I love a girl and she loves me, or pretend to be... The problem is we cannot live our love because others guys love her too and she doesn't want hurt them.
i dunno about the song from she*s the man ... but as for ur other one ... try jimmy eat world - 23 ... it*s a little more on the breakup side but it still has around the same message