He (The taxi driver) then went on to say that in former days he had heard me lecture, but that belonged to his intellectual past. 'Now,' he continued, 'I am a married man and have ceased to be a person.' This seemed a painful result of matrimony and naturally set me reflecting. Why should marriage, which ought to be the fulfilment of personality, be felt as quite the opposite? There was no suggestion that his marriage was unhappy; it was to marriage as such that he attributed this dire result. I never myself experienced any such result of being married, but I know that the taxi driver was putting into words what a great many people feel.
Source:Mortals and Others; Bertrand Russell's American Essays, 1931-1935, v.1
More info.:http://russell-j.com/MARRIAGE.HTM