This has all got me to thinking (in case that isn't obvious lol).
Yes, attachment style as pdm mentions, you haven't known him long enough to find out what his is.
One other thing I thought of. Let's turn the story around for a minute.
Mr. Date texts Saturday to cancel - Mom needs help with her house.
You say, np, talk to you again soon!
Mr. Date reschedules for the next day.
Is Mr. Date needy? I mean you missed one date, he wanted to see you within hours, how needy is that, could he not have waited until the next evening or Sunday??
Well no it doesn't mean anything of the sort, but I bet if it were you, you would have been asking, should I ask him for lunch? I mean we just missed one date, maybe I should wait and call him on Sunday?
See what I mean.
Also, what you perceived he was like on Saturday may well be him picking up on your emotions because of Saturday. You are now wary of him.