I would have left in the middle of date. I'm sure there's some guys on here that would have said you didn't say this man.
This is the big difference between me and I guess most guys. I don't date to get women. I date to have fun, when I invite a women out, it is to something that I'm doing because it's what I like, or it's a restaurant I want to try. She is there because I don't like doing sh!t by myself. Why would I walk out on a date if I'm doing something I want. She can fvcking leave if she wants, but not me.
You can not control what people, especially women do, you can however control how you act. You should not give a fvck what women do or don't do. Besides, you have no idea what is going on in her life, what if the woman is checking her phone because she just found out her mom went to the hospital.... she's out with you because she didn't want to cancel, but her mind is elsewhere. Never jump to conclusions, always be a gentleman, and things will work out. If her behavior bothers you just don't ask her out anymore.