dating someone - when is it exclusive?

If your dating someone who you don't know, after how many dates would you say you would only see each other?

I personally have only ever dated one person at a time. I've had my first date with this guy which went well and we kissed etc

I know that he is single (as he mentioned he has been single for the last year and a half), but how do I know if he is seeing other girls? And when is the best time to find out?

thanks

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