I have bro that introduced me to a little headcanon he had. I helped with lore building around it. Characters. Places. Stories. Powers and themes. This went on for years, hanging out with him. Talking daily.

He's stopped contributing to it.
Spends more time with others, on other projects. Other hobbies that are completely different.

Still talk to him. But I am lucky to get his attention a couple times per month. Sometimes less. It used to make my weekend just to hang out, and watch movies, and play games.

It hurts alot desu, senpai.