Possible Clues:

• "Don't worry about it!" text
• 'It's all good,' in a text
• "Don't u worry!"
• "Don't worry abt it"
• 'Don't worry, it's cool,' in a text
• 'Don't worry about it,' for short
• "Don't worry about it," in textspeak
• 'It's nothing,' in texts
• Acronym that helps downplay a brag