The boy and the red haired girl

The boy who always hides in the shadows chases the girl with the light red hair. He knew that his job was to make her trust him, but how was he supposed to hand in the girl that he is falling for? He knows that it can never happen, they both live completely different lives. She has a family and friends, he has a dog and a job. The company he joined was only supposed to help him make enough money to move off the streets, but once he started he'd seen too many horrible things, they never let him leave. He is a broken body and needs fixing. How can he help himself without getting him and the girl killed?