I feel for you buddy.
I recall dating and it can be a really stressful situation for some.
I know my words probably don't mean much now, but it really is better you find out early before you've invested much emotionally, only to get the brushoff.
However, you know that you have to let go of the hurt and get right back into that pool. Sitting on the sidelines will not do you any good. I'm not saying be desperate and jump anything that moves, but don't lose confidence in yourself.
Seems to me she is the one with issues since she couldn't even tell you to your face that it just didn't click.
However, when (yes when) it happens again, remain composed and tell them you had a wonderful time with them and wish them well.
Girls/Women talk
TB
Who learned nearly a decade ago, that to find the one for you, you have to be the one first.
