The song "Deep" by Julia Michaels is about the complexity of love and letting go. She tries to come up with a systematic approach to love and let go, but every time she is with her love interest, her feelings become clouded and she is unsure of how she truly feels. The lyrics also touch on past experiences where she was left feeling empty and broken, but her current love interest is bringing back all of her old feelings. She sometimes feels like she is diving too deep into her emotions and that she might be broken, but ultimately she loves the intense feelings that her partner is bringing out in her. The chorus repeats the line "you're bringing back all my feelings," emphasizing how her partner is making her feel whole again. The song ends with Michaels acknowledging her love for her partner and her inability to shy away from their love. Overall, "Deep" is a heartfelt and emotional song that explores the complexity of love and the struggles of letting go.