Yeah, it's a frustrating thing to feel like you are clicking with someone only for them to tell you that you aren't.
But the truth doesn't matter, the bottom line is they aren't attracted enough, and you have to move on.
I think it takes a man a few times going through this to develop a strong callus about women in general - that when they have options (i.e., young & childless), you haven't secured anything, and she could monkey branch; heck, I think that one time I was the branch.
Just recently I had a good dialog with a younger gal, got her number, tried to contact her, and she just ghosted me.
NEXT! I haven't been with a woman that is older and/or has had my child, so I have no data points about them at that stage of life.