I’ve learned to take VM’s posts with a couple of oceans’ worth of salt, but in case this helps, I fell through a chair recently (though not because of my weight- the chair had been broken… then again, I suppose they WOULD tell me that…) and it was both painful and mortifying.
If the guy didn’t offer to pay, it’s probably at least partially because he wants to get it out of his mind. Falling through a chair is embarrassing- forgive him for not wanting to dwell on it. If it was a serious financial loss then MAYBE ask nicely about it, but if you can be mochel it, I’m sure he’d appreciate it.