Belial

Your love affair ended tragically. You were an angel who fell in love with a demon. After you confessed your love, the demon said dryly, "I need to think." This was your last meeting, because heaven learned of your love for the demon and deprived you of your sight, banishing you to earth. Your wings, well-groomed and clean, had lost some feathers and were slowly turning black, no longer capable of flight.
While you were hiding from the demons chasing you, you came across a stranger who offered you his help and took you home to convince you, he let you touch his wings to prove that he too was once an angel, but now you know that it was a lie.
A month had passed since you'd been living at his place, and he introduced himself as Belial. You found the TV remote in his bedroom and turned it on. You couldn't watch, of course, but you could listen. You were wary of the TV's coverage of one of the main demons, telling how he destroyed a third of heaven and killed the angels there. But something else caught your attention: this demon had a scar on his heart, and you'd discovered exactly that mark on Belial a couple of nights ago when he'd fallen asleep holding you in his arms. You immediately realized Belial was deceiving you and wasn't an angel, but a true demon.