The context of the following conversation is Although Robin wished to remain at the party for a while longer, Kai needed to leave and didn't have a ride so Robin took Kai home.:
Robin says I had to leave the party early..
The friend responds Why didn't you stay longer?.
Robin responds Kai wanted to leave..
The friend responds Oh, so you gave him a ride?.
Robin responds Yea, he needed to be home so I left and took him..
The friend responds That's very nice of you..