I think yes. Significant others are distracting and if you are with a wrong one, they will make your life hell.
Yes. And Yes.
If love isn't that important to you the yes.
I don't want to. I guess its possible but why would you want to live alone.
Well I would say you do need SOME sort of passion. I guess it doesn't need to be romantic, but you do need something you love in life to be happy.