Preston, when people do shitty things, there's a reason. If it is safe to assume that the fault lies with her (and don't be too quick to assume such things), then you can count yourself lucky that you were able to extricate yourself from the situation at this juncture in your life.
I will provide the default advice I always do for people at this age: it is nothing short of a miracle to find someone worth spending your whole life with when you are both still under 30. Even as you advance in age, you are more likely to grow further apart than you are closer together. So get out, do what is enjoyable, and try not to get tied down in a relatively fruitless relationship. It is the storybook romance fantasies that are most crippling to your happiness, I assure you, because they simply don't exist.
That's my "psychiatric advice from the constantly distressed" for the evening.