The quote addresses the impact of betrayal on relationships. "Once you do me dirty" acknowledges a breach of trust.
"I may forgive but I'll never treat you the same" signifies a shift in behavior towards the person.
"You'll never get the old me again" emphasizes the lasting change in the dynamics due to the breach.
In essence, the quote reflects the lingering effects of betrayal. It conveys that while forgiveness might occur, trust and interactions can change permanently. It's a reminder of the impact of actions on relationships and the potential for shifts in behavior and attitudes after experiencing betrayal.