If you do a favor for somebody that didn’t ask you to, they are NOT obligated to return the favor.
Now if you guys are friends, I think you probably should pay it back one way or another, but you don’t have to.
I agree, and also I think if you are actually friends with someone you don’t count favors, you just help them out whenever they need it and they do the same to you. And sometimes neither side can help out and that’s okay too!!!