So what was resolved? my $0.02: She's older and should know better...if she didn't still have feelings, it wouldn't bother her if he texted 1000x a day...It was right to leave as why go thru all the drama...It is kind of wierd, IMHO, that she does this in front of you...why the posturing? is she or better yet, are you that insecure that she need to do that in front of an audience? if she cares she'll be back...
I don't know if you have ditched her already or not. But, more than likely, at least in my experience, he was trying to "come back". Which is why he was texting and calling her. It's not like she's going to change her number just because they broke up. Just because she did it with you there may mean that she had just reached her limit with "Ex boyfriend of two years". The first time she broke it off with the guy on the phone was likely a rebound guy and she had decided that you were the better choice. And maybe she wanted a bit of moral support because she isn't used to breaking it off with guys? I dunno. If you ask me you over-analyzed the ex-boyfriend thing. And the fact that you blew her off over it, doesn't show that you are really certain about the girl in the first place. The exception to this is if she was saying things that made you think she wants to be with the ex rather than you. Chances are if they dated that long, she felt pretty strongly about him. Especially if he broke it off there is still going to be some doubt in her mind as to if maybe he deserves a second chance. But to be honest, unless she broke the date off with you saying that she needed to go talk to the guy, you were fine. Until you ended the night early. Hope that helps. Heck it may be resolved by now But since I am older than your "most females here are like 25 years old" and had more than "the 1-2" relationships I figured I would answer.
