Personally, I love solitude and I've had a lot of it in my life. When I don't get enough of it, I become agitated, resentful, and I yearn for it.
But many folks aren't that way; they don't like it. They may actually fear it - greatly. And the fear of being alone sometimes forms the walls of a trap - keeping them in a bad situation because the alternative - solitude - seems far worse. They may also apply pressure to others to keep solitude away and this can cause its own problems.
Like most fears - fear of solitude is based on an illustion, but you have to walk into the thing you fear in order to discover that.
If this has been an issue for you, then let the healing begin with this wonderful video about learning to be OK with being alone, by filmaker, Andrea Dorfman, and poet/singer/songwriter, Tanya Davis.
Perhaps you can dabble in aloneness, and unlock a few cages in the process.