Loneliness Can Devalue Your Relationships
When a person is lonely, their perception of any relationship can change. This results in them slowly devaluing those relationships, then withdraw further from the people that obviously care about them. They will even tell themselves things like how they do not feel like they matter to others. Their loneliness has, in this form, led them to a depression stage that caused them to even devalue themselves.
When a person spends far too much time alone, even when you used to do things with them, they have started this stage of devaluing. It’s not as if they are trying to actively do this, of course. They find themselves in an issue they cannot technically control. Possibly, they won’t talk the way they used to when you hang out with them. The next case, perhaps the worst, is when they begin to push away. Making them remove the very thing that could help.