I mean, seriously, I'm a big girl - if you're not interested, just tell me. but please! Why even bother with the "I'll call you tomorrow" if you're not planning to call the next day, or ever, for that matter?
At the end of the date, if you just KNOW you don't want another one, just say "Take care" or "Have a good night" or something like that? Instead of "I'll call you tomorrow?" That is the dumbest thing!