"Personal Love Lessons: Self-Love"
Once, I loved someone who didn't love himself. I didn't realize it at the time, but loving a person who lacks self-love is like pouring water into a cup with a small hole at the bottom:
If you pour a whole, whole lot, all of the time, that cup will remain full. But as soon as you run out of water, or get tired of constantly pouring, that hole continues to negate your loving intention. The cup leaks and leaks and leaks, until there is as much water remaining as there was in the very beginning. It is empty.
For your own sake, so that you can remain full, love someone who is already complete. Love someone who already loves himself.