I don't know how to feel

At the beginning of the semester (about a month ago) I started seeing this girl. We seemed to click pretty well, and we talked all day long almost non stop. After a bunch of previous relationships built on lies and sex, I really wanted to make this one work. I had been craving a real relationship for a while, and this seemed like my first opportunity to have that. So obviously I was super excited about it all. We got to really hangout for the first time about a week ago, and it was absolutely magical. We got ice cream and then sat on a park bench for a few hours just talking with the water fall in front of us and the stars above us. Things seem to be going absolutely fantastic. I really really like this girl! Earlier today, we were talking about her game tonight (she plays college volleyball). I was super pumped because this was going to be the first time I would get to see her play. All the sudden out of no where she tells me that she doesn't think we should see eachother because she isn't over her Ex yet. Now i'm okay with this. At least shes honest right? But she went into greater detail as to tell me that everytime we kissed she couldn't help but think of him. So that stung. I haven't talked to her the rest of the day, and I'm lost as to what to do. I've been so use to talking to her all day long. Girls are dumb.

TL;DR She misses her Ex. Fuck.

EDIT: apologies for wall of text