She may not be able to fully appreciate anyone for that matter. I know for me, I tend to take things very personally, but just know it's not you, it's her. She's got some issues and those are entirely apart from you as a person.

But yes, to your point, she didn't deserve you, and you deserve far better than that kind of treatment. Someone who cancels hotel plans last minute and who makes you eat the cost of it is extremely selfish and thoughtless. So is someone who plans on cheating. They are out to fulfill their own needs at the expense of others and don't stop themselves from committing hurtful actions because it's amoral and thoughtless. That is a very selfish person at heart.