A Wall Between Them
There is a wall built between them. It's not a physical wall but rather is an invention of their minds. They share a mutual desire and disdain. Together they cannot function – they cannot stand one another – and apart they are doomed to lives of loneliness. Half lives.
They can't have it only one way. They can't chose desire over disdain. They can't eliminate one half of what they feel. To do so would be lying to themselves and each other. They either have to take it all or leave with empty hands and hearts.
They balance on a treacherous thread.