It's a personal thing. Some people love to be alone (like me) as there is no one to bother them, make demands, tell them what to do, etc. Doesn't mean I like to be alone ALL the time. I'm just comfortable in my own skin and don't need other people around. I have plenty of friends and acquaintances to hang with when I want but am happy being alone as well.
On the other hand, I know plenty of people who simply either hate to be alone or are afraid of being alone. My brother is a prime example. He's been married 3 times and jumped into the next one months after the previous one ended. His first wife was twice as big as him, his 2nd was twice as old as him and the third/current is twice as ugly as him. Once I was visiting them and his wife pulled into the driveway and got out and I thought it was a man. YUCK!
I'd rather be castrated than have to have ANYTHING to do with any of them in the bedroom. I often tell people that my parents had another son, but I don't have any siblings. I can't accept that I'm in any way related to that guy.