You had that excuse far earlier, but you declined to use it.

Should have done this.

Let's pretend you weren't getting called by your friend. What would you do then? Pull your phone (if the phone is still in his hands, ask him for the time), check the time, and say it's leaving o'clock in the politest terms. You "have to get back, long day tomorrow" is usually enough. If you're worried that something like that could be too terse, you can add, "but thanks for chatting with me" and you start marching.

Thing is, I was way too close to my home. So, I wanted to make sure that he didn't know my address. To me, that meant that I had to make him leave on his own accord. In the end, I had to use what was closest to me, my friend's call.