The Starlite Heart Part I Impossible to Love

There is an age old story - some call it a myth, some believe it to be history.
Nevertheless, the fact is that there exist three different species who look alike.
First are the underwater dwellers - the nymphs. The myth says that they are cursed never to find love. They are all females and mate with humans. The humans die immediately afterwards.
Second are the starlites. They live among the highest mountain peaks unreachable for humans. They can fly, and their hearts are cold as snow. They are cursed never to feel love or get loved by anyone.
The third is the human race. Humans can feel love, get love, cherish it and are hence considered worthy to rule them all.
The story revolves around a starlite soldier Sophia Antofurota who leaves the army to join the Guardians. The Guardians are a team of starlites who work for the humans.
Neal is a manipulative, scheming human prince who offered the job to Sophia only because he is in love with her.
Sophia gradually finds out that the royalty is hiding many secrets but never suspects that she can have any part to play in their schemes.