I don't understand the problem.
Especially if you consider him your friend, why should you worry about paying him for something that happened without your fault. He is heavier than you, mean it would break next ride under his weight, so HE should pay you for avoiding worse scenario.
Besides, what are you trying to get from the quote? Peoples opinions for its own sake or you really want to decide for yourself?

If you feel like you want to help him and pay - go on, it's your money.

I don't see a problem here...