I feel really sorry for her boyfriend, that's such an inappropriate thing for her to say to you when she's in a relationship with someone else. In fact if I were you, I'd be slightly put off with someone that would say things like that to another person when they were in a relationship, I just feel that it's rather disrespectful. Having said that, it's not anyone's place to judge her from a few lines posted about her on an internet forum.
But all that aside, if I were you, I'd leave things up to her, don't intefere with her relationship, you already had your chance so to speak. It does sound like she's interested, but at the end of the day, she's the one that is committed to someone else and if she wants to start anything with you I think she needs to rethink or that committment. I don't really think it's your place to pursue her at all, and would be especially bad if you've met her boyfriend and got on with him, it'd be like backstabbing him.
Also remember that you probably broke up for a good reason. And like the person above said, don't underestimate how many more people you will meet at uni, how much you will change, and how much what you want will change. For the mean time, I'd ask her not to make comments like that, because it's only going to mess with your head.