We're not together, technically. But she broke up with her boyfriend for me, she openly admitted it.
He was her first, and they've been dating on/off for about a year.(Previously they dated 2 years during highschool.)
During that on/off year, I came into the picture and her and I became very close.

Anyways, to the point... a few weeks ago when she broke up with her boyfriend, she said that she would see him one last time, and that was it. Today I've come to discover that she went to hangout with him and a few friends at a get together.

Should I be upset?