Never had either happen as well, But I would say if it's the first time to even go on a date? You not need any closure, I would not have any feelings about it at all - I would not even know them.
If they chose to call with a good explanation fine, if not he is probably married and just saved me from wasting my precious time. ( No need for closure period. ) You don't even know them, and furthermore maybe you don't want to know them.
If your seeking closure on someone you do not even know.. work on your self esteem first and foremost, You should be thinking oh well and then go shopping with a friend or something instead, It's a waste of your life and time.
Think about it, and even if you got someone like that who could do that to you, To manage to call and go on a date would your really want to?
And then what? dream of spending 20 years with someone you cannot change?
I've seen the nightmare it is for people to catch the one they should have ran from, Trust me - it's not pretty.