"Spottedleaf! I am SO jealous of you! Firestar loves you more than me, because I suck!"

— Sandstorm telling Spottedleaf that she is jealous of her
Sandstorm had some anger issues as a child and originally had a HUGE crush on Dustpelt but eventually Fireheart saved her and she decided to have kits with him instead.
The result is the two hot messes Leafpool and Squirrelflight.