Maybe he's just too busy with his own life and doesn't have the time.
Perhaps there was a specific incident or something in your stories that turned him off. Or it might be that he's dealing with personal issues and has to cut back on his entertainment consumption, including your stories.
It could be that he's lost interest or found something else more engaging. Maybe your stories aren't hitting the mark for him right now, or he's going through a phase where he's not in the mood for that kind of content.