It is quite simple: if someone does not have any sucess in OLD or outside work, then how come they are thinking that they will have something different going for them in the workplace?
If I have to resort to this, it implies no one among my peers whom I already see every day because I study or work or live next to them or hang out with their friends etc. is willing to have a relationship with me. (Or they were but then dumped me. Or my standards are idealistic and any real person I know sufficiently well will fall short, guaranteeing a short or dysfunctional relationship for you. Or I am in a relationship and am dishonest to my partner. Most explanations would not be in my favor, except maybe if I lead a solitary life without much social contact and that also begs the question why (unemployed? nomadic? etc.))