Light and Darkness+Fire and Ice=love?

she is a girl with no parents and thinks nothing good of herself by the way she was raised. She is the definition of black and white, yin and yang, light and darkness. even her name stands for light and darkness. People only see her as light, but that's only because they haven't seen the other side, the dark side. The only way to use her powers is by letting her dark side consume her, which means hurting the people she loves and could kill her.
He can use his powers unlike her. specifically, create fire and ice. He's a thief and a ruthless killer. He doesn't take hostages. Until he meets her something about her puts fire in his icy heart. He can tell she has a dark secret, that she seems to be fighting something seilently every day even though there's nothing there.
Can she break through his piercing ice glare and can he save her from the darkness