The quote "Once I stop caring, you're not getting it back. I'll be cold as ice, I promise" captures the sentiment of guarding one's emotions after reaching a point of detachment.
The quote suggests that once the speaker no longer invests their feelings or emotions, they will maintain a sense of emotional distance and detachment.
In essence, the quote speaks to the self-protective nature of human emotions. It underscores the notion that when someone decides to disconnect from a situation or relationship due to emotional hurt or disappointment, they may choose to build emotional barriers to prevent further pain. The promise to be "cold as ice" signifies a determination to shield oneself from vulnerability and emotional investment. The quote serves as a reminder that caring deeply for someone or something involves risks, and when that caring is withdrawn, it can be challenging to regain the same level of engagement.