Caught in a lie

There is a world, hidden of the mundanes, the humans, where the heroes discriminate and the "villains" are convicted of their demonic descent by shadowhunters (a demon hunting society).
Alec,one of the heroes and Magnus, a warlock with demonic blood, fall in love.
The government of the shadow world stands in the way of their love; but it won't stop them from loving each other. Only the fact that Magnus is immortal and Alec will die one day makes them doubt their relationship.
But Alec's siblings, as well as his friends Simon and Clary, will support their relationship, despite the problems of their own love life.

Because the truth hurts more than the lie, you cover your ears with your hands.
Until someone comes into your life and takes your hands in theirs to confess their love to you.