The song "Things You Don't Know" by Haley Joelle is a heartfelt and nostalgic reflection on a past relationship. The lyrics depict the singer reminiscing about their former partner and the small, everyday moments they shared. In the beginning, the singer mentions being diagnosed with frostbite in their toes, highlighting the coldness and emptiness they now feel without their significant other. They drive to a familiar place, Rite Aid, where the couple used to go, remembering how their partner would make a joke about "getting cold feet," a clever wordplay representing their fear of commitment. The singer remarks that their new place has heat, symbolizing their ability to move on and find comfort without their ex. The chorus of the song expresses the singer's longing for their partner's return. They share how many things have happened since they've been apart, and they imagine the joy and laughter their partner would bring if they were together again. However, the singer has to remind themselves that it's okay their ex is not coming home, as they have learned to cope on their own. They keep a mental list of all the things their ex doesn't know, indicating the personal growth and self-discovery they have experienced since the breakup. As the song continues, the singer expresses their pride in overcoming heartbreak and the scars it left behind. They mention having written twelve songs about their journey, which they play when they wonder about their ex's whereabouts. The lyrics convey a sense of longing, wishing their partner could be there in moments when they can't sleep or when they're feeling down. The singer contemplates sharing their experiences with their ex in the future, hinting at a potential reconciliation or closure. Overall, "Things You Don't Know" captures the emotions of missing someone and the process of healing and moving forward after a breakup. It reflects on the personal growth and resilience gained from heartbreak, while still holding onto the memories and longing for a connection that may no longer exist.