I don't care about her after she cancelled our date.
Is that your way of handling things?
Yes, she ignored me, so I ignored her.
Perhaps she had a legitimate reason to cancel, but I know how upsetting that can be. How about after cooling down you can try attempting to contact her one last time about it?
Screw other people feelings. I can do what I want.
You can be upset about it, but don't let it overtake you. Maybe you can reschedule another date, you should not give up so easily.