Actually I've had it happen quite a few times, but it's been my own fault every time either for using condoms that were too thin or the wrong size when I first started using condoms or being drunk when putting them on.
Right, as you yourself admit - it has nothing to do with trust. You can absolutely trust or not trust someone, and a condom can still break, maybe because you made a mistake, maybe for some other reason, but trust isn't the "main" issue.