I leave to visit a customer and leave my iPhone charger plugged into my computer.

I come back and my colleague has my charger, the converstaion goes as follows.

Me: "Can i have my charger back?, it was plugged into my machine before i left."
Colleague: "Why do you need it?"
Me: "To charge my phone?"
Colleague: "Yeah, but i need to charge mine"
*The cable is plugged into his phone, charging*
Me: "Yeah, but its my cable, that you took"
Colleague: "Just wait until I'm done"
Me: null

What has even happened lol