What to do when our teachers cant even last in the world?

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I am a college student. There was this math teacher I sort of knew him but not that well. He was not my teacher. We left frieday to head into the weekend well sadly when we came back we had learned that a teacher had killed himself. He was ok he never showed signs that he was having a hard time. He was one of those teachers that cares a lot about his students well I guess we were wrong. I feel so sad for his two girls. How do you feel about a teacher killing themselfs? Have you had anything close to this happen to you or you know?