Sorry but I have to stop you right there. It might seem egotistical from the outside, but we should NOT judge and draw conclusions without knowing what's going on inside his head.
He could simply be an introvert (like myself) who enjoys solitude over socializing. That might seem wrong but keep in mind everybody is different. Some are extremely extroverted and can't be alone, others are the opposite. As long as that's his own, conscious choice there's nothing wrong with that.
That might also be the reason his relationships didn't work out, some people really need their own space. Sean has said multiple times he loves to live alone instead with a roommate or partner.
It's hard for us introverts. We still want and need friends and contacts, but it's overwhelming and stressful when we can't control and regulate it and are unable to withdraw from people when thingsget too much and we need space. That's very much impossible unless you live alone.
Besides that there can be mental health issues at stake where we don't know about and it really isn't up to us to draw conclusions on any of that and call him egoïstical and dysfunctional while he's probably just taking care of himself by doing this.
Don't judge people for being different. It can be hard enough already when you don't fit in.