Who do you call soulmates? A couple with 25 years of togetherness. Struggled together, grew together, faced all the ups and downs. Having fought and reconciled, raised a family, the relationship stood the test of time. OR Really passionate and intense 2 years together.
The meaning of this quote is that you cannot have a "healthy relationship" with anyone unless you love yourself. If you don't love/value yourself there is a good chance that someone will take advantage of it and treat you badly.
Have you ever walked away from someone you still loved?
When someone takes you for granted, RUN ! In 5 years time, you won't be crying about that person but About the fact that how dumb you were and how you let yourself down by being so needy and crushing your self respect :)
If all you can remember at night are the missed opportunities, you've been existing till that date. Loving someone with all your heart is living and loving with precautions is just existing. Maut k liye tayaar rehna is Living aur maut ka intezar karna is just Existing.