Quote from : City of Glass Book

Why don't we talk about your love life? Clary countered. "What about you and Alec?" "Alec refuses to acknowledge that we have a relationship, and so I refuse to acknowledge him. He sent me a fire message asking for a favor the other day. It was addressed to 'Warlock Bane' as if I were a perfect stranger. He's still hung up on Jace, I think, though that relationship will never go anywhere. A problem I imagine you know nothing about...