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take it easy on yourself. We don't all know how to recognize the signs. We don't all have knowledge of psychology and we are not all professionals. And like you said he was an optimistic guy. So don't blame yourself. He did not call you saying he was going to kill himself and you did nothing. Had you known i am sure you would have tried your best to prevent it. So you have no fault here. Nothing at all!!!!!!

As for being angry with him, don't be. Just pray for his soul and that he may rest in peace. Try to do some nice things in his name like charity. Charity and prayer is the best thing you can do for a dead person. In my religion we believe that these two help the dead even after passing. So try to do these two. And be easy on yourself.

I'm very sorry about what has happend to you. Even though you were the last person to speak to him it's not your fault, If somone is upset or Angrey they often use lines like 'I want to kill my self ...' So generaly hardly anyone would notise little signs. This person was obviously emotional depresed and unhappy in there own skin and didn't want to live anymore wither that or they felt alone therefor they were attention seeking. If somethink tragic has recently happed to him then he may have wanted to just go. Often people can put on a mask they don't want people to know how they really feel so they lock up there feeling and put on a smile. Many people get depressed and commit suiside unfortunatly often these people don't think of the people there going to hurt in doing so they dont hink about there friends and familys reactions they just think 'I hate my self i want to die' Dont worry that you were the last one to speak to him because it's not your fault ! If he was someone special to you or anyone really its normal to feel sad and angrey, Dont be guilty x

There is really nothing that you are supposed to do. Just try to find a way to grieve your pain for the loss of a friend so that you can move on. Try venting out to someone you trust or write in journal about how you feel to help you feel better. The death of your friend IS NOT your fault. Some people are just really good at masking their emotions and it's hard to read friends' feelings sometimes. Things will get better for you. Best wishes to you. :)

Nothing, it has happened, some people are very independent, and are very reluctant to burden others with their problems, clearly he was. There is nothing you can do but mourn him appropriately, conversing with other who knew him can help as well.

Celebrate his choice to end his suffering.