Parents, family, teachers, and friends sometimes experience doubt when questioning a loved one about suspicions of behavior that might indicate suicide. When the loved one strongly denies any such thoughts, it should heighten doubt. There is no reason to feel guilty about wanting to address the problem.
Religion plays a role in maintaining silence in those experiencing doubt. Mea Maxima Culpa, "Silence in the House of God." "Doubt allows us to sot the sharks around us."