This song touches me on a personal level, having a long distance relationship myself. I have to wait until I finish high school to even visit my boyfriend, then I have to finish college/uni until I go to live with him. Having this experience makes me more capable of understanding the song's lyrics and meaning.
The guy who wrote this song is obviously in a band and must go on tour from time to time, and leave his girlfriend behind. His girlfriend, however, feels that he cannot give her what she needs, such as attention, quality time, and sex that is essential to a relationship and not having that is hard sometimes. While he is gone away, she has to remain faithful and wait until he gets home to receive any of this, so it is understanding that she would want to break up. Even though the guy seen this break up coming, he was still taken by surprise and was in denial. The guy felt like he would never be genuinely happy again, and when the girl suggests they be friends, he rejects her. He does not want to be just friends with the girl that once meant so much to him. "I'm not some boy that you can sway" is him telling the girl that he is not going to be one of those boys that she just tosses to the side and watches her fall in love with someone else while he still has intense feelings for her.
If you think otherwise, please leave your own opinion so others could read and get an accurate idea of the song's meaning.