My weight is about 100 kg as well. I never broke a spoke in more than 30 years. A well made wheel is remarkably strong, much stronger than most people think; able to carry up to 700 (!) times its own weight.
Spoke tension should be equal and high, making the wheel "inert", not vurnerable to metal fatique.
It is not a good idea to simply replace one broken spoke. Have all spokes replaced and the wheel rebuilt from scratch by someone who knows what he's doing.