I really don't know what to say that other people haven't already said. I lost a friend to suicide in my early 30s - very much loved person in her mid-30s who was a community musician and music teacher. She held a weekly get-together at her house teaching anyone who was interested about American Indigenous musical instruments like rain sticks etc, and busked at the local markets with her acoustic guitar. Always happy songs, and that confused me a bit because I like music to acknowledge the dark side as well, and I thought, does she not see it?
So I was totally blindsided by her suicide - and so was everyone I talked to from the community who turned up at her memorial. It was her brother who told me when I knocked on her door one day as usual - and explained what none of us had known - that she was bipolar and only came out when she was happy, and that when the darkness engulfed her she stayed in her house and hid because she wanted nobody to see that, and that she had now taken her own life.
There were over a hundred people at her memorial. We were so distraught because we had never had a clue this was on the cards. We loved her and would have wanted to be there for her in the bad times as well as the good. The stigma and shame around mental health issues are so terribly unhelpful. This is nearly 20 years ago now and in Australia at least, we talk about it more, and her death is one reason I decided to be totally open about complex PTSD and growing up with domestic violence. Because we can't be party to hiding these things and pretending they only happen to "other people" or allegedly "weak people" - all of that is such BS and needs an humongous reality check and constant challenging to kill off that ridiculous stigma and shame.
One thing I learnt from my friend's death is to never make the mistake again to think someone is necessarily happy because they look it.
I process lots of things through music. Here's two songs that come to mind with this kind of situation. The first is about all sorts of stuff, including pain and addiction.
The second is specifically about losing a friend.
Life can be very sad, but also beautiful.