Unlike some of the other commenters, I think maybe you weren’t that into her.
From my experience, and I’m a kinda shy guy, when I’ve seen a woman I was really attracted to, who showed interest in me, my “inner man” demanded that I take action. At those times I was definitely telling myself “Holy Shit! She is awesome. God I want to (lewd things) with her. . . and get to know her and hold her! God I want her! Damn. I am definitely not going to sit this one out.”
I’m not hearing anything like that here. . . . I think you need to move on and look for someone that makes you feel like that. It’s pretty primal, but it’s real.
I’ve been married to a woman that makes me feel like that for the last 9 years.