During a BBQ my friend said he was arrested for domestic assault when shouting at his partner

https://frostland.timeforchangecounselling.com/understanding-disclosure-what-evidence-the-crown-must-give-you-in-toronto

During a BBQ my friend said he was arrested for domestic assault when shouting at his partner, a few of us had no idea the complainant can't just drop charges, it felt unreal.