Hey it's not my fault if they ask why I live in such a big house myself, and the truth is "Cuz my ex left"...
Then they ask "Why did she leave"...
But see, that's the problem Ryan, why is it such a problem to talk about that? Maybe the girl really likes you and just opening up because she's scared to get hurt again, personally I find it a bit judgemental and selfish, but each to their own, in your own way you are protecting yourself from what I assume is a previous experience either you went through or you saw it and don't like it and don't want it to happen to you.
Personally, I always hear someone out, even if I don't like it.