Sold to the Circus

AITA: Am I the asshole?

Five years ago when she left, she broke my heart. No warning. No hey, this isn't working out. No nothing.
Just poof. One day she's there, in my bed, and we're talking about our futures. The next, she's gone.

So when she shows up five years later and acts like she didn't leave me with a broken heart, I get angry.
So. Freakin'. Angry.

Of course, this is where I spiral. When we went through medical school together, we were on equal footing. Not anymore. Now I'm her attending...