He sees her looking at him with interest, and is encouraged to go on. 'I wouldn't be here with you now. This wouldn't be real - something else would. You'd have been another you, instead of the one you are now. You can't be tied down to a predestined fate when you change according to your situation, and your fate must change too. Everything depends on circumstances - on which "you" you happen to be at a given time...
Anna Kavan, Who Are You?
fate, identity, reality, situation, the-self