I think "And another one goes, and another one goes by" refers to failed relationships, maybe trying to fill a void? The person he sees right in front of him is another prospective relationship, but he doesn't think he has anything for her, or that he's not worthy. After every failed relationship, he keeps considering her, but he can never muster up the courage. So he keeps going through partners.
I think "And another one goes, and another one goes by" refers to failed relationships, maybe trying to fill a void? The person he sees right in front of him is another prospective relationship, but he doesn't think he has anything for her, or that he's not worthy. After every failed relationship, he keeps considering her, but he can never muster up the courage. So he keeps going through partners.