I think there are people who are always looking for relationships for whatever reason (they always feel incomplete when they're not with someone, they have emotional problems and feel the need to latch onto someone else, etc.). But I think this song is about people on the other end of the spectrum. People who never think they need a significant other to make their life complete. I always picture this song being from the perspective of someone who had missed out on what he/she thought could've been true love because he/she didn't want to commit or didn't have the time for it. So in a way I agree with PrenticeGT's view.
I think there are people who are always looking for relationships for whatever reason (they always feel incomplete when they're not with someone, they have emotional problems and feel the need to latch onto someone else, etc.). But I think this song is about people on the other end of the spectrum. People who never think they need a significant other to make their life complete. I always picture this song being from the perspective of someone who had missed out on what he/she thought could've been true love because he/she didn't want to commit or didn't have the time for it. So in a way I agree with PrenticeGT's view.