Is it normal that my friend did this?

He probably had a lot on his mind and didnt know how to express himself. Im sorry about your friend i just lost my nan 2 days ago I understand.

I don't think it's normal that he was so open. But I wish more people were as open as him.
My condolences.

I'm sorry you lost your friend.

He probably had problems connecting with people, even if, apparently he managed to do it successfully but this is clearly something that bothered him. Some people feel isolated even though they have constant social interaction with people. I'm sorry i am not a specialist in psychology but there are a lot of people who experience depression for no particular reason and it's very hard to see through the happy mask they put on so you can't really help them, nor can you figure out they need help. Only they can help themselves by getting treatment or opening up to people they trust, confessing to them and communicating. There are lots of people who seemed really happy and outgoing before they shocked everybody and took their own life.
The fact that your friend tried so hard socializing with random people was a clear indicator that he was subconsciously seeking for peoples acceptance. He seemed to try to find a solution to an issue, to something that was bothering him.
Although i usually have no sympathy for people who kill themselves,because i think life is a gift that you should cherish as long as you can,and taking your own life seems like a coward move, i feel sorry for your friend. It seems like he was misunderstood by people.

Hello, I am sorry for your loss. Perhaps the best opinion I can share on the matter is this --

Many extroverts (have the ability to talk to anyone, essentially)communicate with "ceaseless" verbosity. We tend to think of people who talk to many people with ease as perhaps more socially and emotionally adapted, thus happier. Nevertheless, some of the saddest people I know are talkative, charismatic extroverts.

My ex boyfriend did the same thing your friend did, and I asked him why he did it. He responded that it gave him meaning; making someone feel important for a half-hour chat gave him a temporary feeling of significance and that he fed off of the admiration he received for his charisma. I'll never forget him saying that he was terrified of being alone. He said that he needed to be out, talking to people, trying to impress them because it occupied the time he'd otherwise spend alone - loathing himself. It was a void deep within that even I couldn't ameliorate completely.

I look up to your friend, I wish I could be like that :)

People who have disjointed and out of context conversations often have severe mental problems and without treatment can lose their way and become totally disassociated. Suicide is common in these people, as they realize that how they relate to others is abnormal, but have not the ability to change.
You could not possibly have known, nor could you have done anything to stop his suicide, so please do not feel guilt.

I used to know a woman who had Borderline Personality Disorder but was able to be the most outgoing, bubbly, super sociable person with people. She was especially this way with people at her church and guys at the gym. She confided to me that it was a mask. Underneath it all she could cry at the drop of a hat and said she didn't trust anyone who'd never contemplated suicide before. You'd never guess it to look at her if you didn't know her.