As you were informed when you began posting your thread, this forum is for US law only. US and Canadian laws are very different.
That said, I have considerable expertise in Canadian law and will answer your question.
While Canada does have varied and strong privacy laws (unlike the US), these laws do not extend to employee comments to their employers. Comments to your employer about feeling suicidal at some point in your life are not protected by Canadian privacy laws, ergo, your employer has not broken any laws by passing these comments on to your coworkers.
Had you shown your employer a doctor's report wherein the doctor diagnoses you with suicidal tendencies, your employer discussing that report with your coworkers might be considered a breach of privacy. However, nothing in your post indicates that that is what occurred.