What justification could I have for entering a committed, long-term romantic relationship?
It's probable that I would enjoy many aspects of the relationship. But it seems counter intuitive to say that I should enter a loving relationship as a means to promote my self-interest. So self-interest cannot be a justification for entering a loving relationship.
The relationship might also benefit my partner. But there are lots of people who could benefit from being a relationship with me. No one would suggest that I find the person who most needs a relationship and pledge myself to them. Most people select long-term partners based on beauty or compatibility, not on neediness. Besides, few people would appreciate being in a relationship with a person who was only in the relationship out of pity.
One could say that I should enter a relationship because it benefits me and my partner. But a combination of two bad reasons is rarely a good reason.
Finally, one might suggest that my partner deserves a committed relationship because she is physically/intellectually/spiritually beautiful and this beauty motivates my romantic love. But this is elitist. Why should I commit myself to the service and assistance of a beautiful person? If anything, I should seek to help the ugly people. This beauty justification for love undermines our commitment to human equality, because it demands we show special concern for people we find beautiful.
In light of these objections, is there any justification for committed romantic relationships?