"You're a really great and sweet guy but I don't feel a spark".

It translates to:

Sorry love, but you don't turn me on and that is a deal breaker for me

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Two things are important on a date

1. That you go up close and dig into who she is .. both the good stuff and the stuff that is less good. Shows interest in her and that you don't see her as just any girl .. cause you're happy with any girl. Already here you're creating a bit of intimacy and a bit of tension.
2. You gotta be able to sexually escalate sexually. Be able to talk freely about sex and run a little marketing campaign. You don't need to make out or sleep with a girl on the first date, but if you don't get her at least slightly curious with regards to sex with you, you will get the "Sorry you're a really great guy, but ..."

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If you're really hot and it's dead obvious that you've had plenty of girls .. it doesn't matter, but if you're not then you gotta prove that you know your way around girls. That is done by being very relaxed and open around sex.

Don't be pushy, don't be needy. If she pulls back you stop .. if she actually rejects you, you accept that with a smile on your face without ruining that mood ...

Don't go until you've established chemistry and you're both enjoying yourselves .. but once that is in place, you have to go there .. simple as that.

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Too me most of my 20s to realize this, but it's just how it is.