Should I stop someone from committing a suicide? I do not know his/her life and

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Should I stop someone from committing a suicide? I do not know his/her life and what he/she might have been through so it is fair for me to assume that he/she is not making the right decision. For example, he/she is suffering and had already done everything he/she could in order to improve her life, ex. talk to someone, reflect, meditate, etc. What if I had just cause him/her to suffer even more? Suicide could have been the best way out for that specific person.