The Promise - A Rewrite

"They say you only need to try heroin once and you're addicted," he whispered. "Elena, you're my heroin." She was only meant to be a one night stand, but he can't stay away. Now she's his employee and he can't avoid the growing feelings he has for her, but he has secrets. He's engaged to a woman he can't leave without destorying his life. Is she worth destorying his life for?