I guess LeAnn Rimes had the right idea...
http://www.youtube.com/watch?v=zuTKD7_okUA&feature=related
...but also, maybe, commitment mean different things to different people.
It's too easy not to commit to anything these days - Try before you buy, Money back guarantee, 30 days trial - slogans that exonerate one from the responsibility of purchasing, of making a commitment to keep the product.
I guess it goes without saying with relationships as well. Society makes it easy to file for divorce, and we absorb it from watching, and accepting that relationships break down for the smallest of reasons.
Being committed in a relationship means keeping the promises you made to each other...
...and not allowing others to blow it out.