This is my opinion. I think it's about how he was happy to have a friend but had to pass on. (Passed away) I think it could be because it might of been from depression, anxiety, stress, pressure, distress, hopelessness, misery, uselessness, dullness, feeling like your a mistake, etc ( sorry to many words said right?) but he passed on happily because he was glad to have a friends.
I also think this because of how the music is down to near sadness and acceptance. But this is my opinion on how I heard the song