What is self-love? Self-love is really possible only when the self is worthy of being loved. For self-love to happen, the petty and divided and confused self has to be elevated to the point where it is clean and shining and expansive and fearless. That is real self-love.
Now you also see the relation between aloneness and self-love. Aloneness and the state of self-love are one. In aloneness, you have turned worthy of love. In loneliness, you despise yourself.