Muteness

He just needs someone to listen. It's a good thing she doesn't talk.

Max is new in town. Struggling with family and loss Max just wants someone to simply give him the chance to let it all out. No interruptions, no judgement, just ears, making Luna the perfect candidate.
No one knows what happened to Luna. She lacks emotion and the ability of speech as far as the world can tell. Pushing everyone away, who knows how long it is until her sanity diminishes along with her unknown thoughts.

Sometimes the hardest things in life come from within, and we just need that one person to help us get back up again.