If I see a girl that I cold approached on campus, set up a date, and then she flaked. What do I do if I see her again?

For example, I saw two girls today one that flaked and one that I didn’t get too far with and I just kind of ignored them and kept walking. Am I butthurt for not saying Hi? Why do I feel awkward when I see them? What do you guys do? These girls aren’t in class but rather random girls I’ve approached on campus. What’s the redpilled way of handling this?