Most Helpful Guy
Because you haven't figured out the best way to deal with being single.
I'm single, and have been this way for many years now, and it sucked, but then I started focusing on myself and on the casual lifestyle, and I actually like it. Sure, sometimes I wish I could have someone I'm close to, but since it's not gonna happen anytime soon I'll just enjoy being with whoever I want.
This may not work for you, but it works for me.