Like that Flaming Lips song, we can spend the rest of our lives fearing that "life goes fast and it's hard to make the good things last" or we can take advantage of the time we have and give a crap about other people.
In order for us to know how to commit, we need to understand what it means to be committed. People's needs are changing, and we live in a society where our individuality is a big part of our growth process and who we are.
All couples come to therapy with good intentions. They all desperately want to improve their relationships and make them last. But the only way that happens is when each partner agrees to change their behavior.