Hmmmm, are you getting any kind of gut reaction on this one? I am reading subtle signs in your post that you don't trust this woman, but maybe that is just me.

I have remained friends or maybe just on friendly terms with some exes - but not the ones that I felt treated me poorly. I would stick with indifference and reduce the friendship aspect of this one, personally. You broke up for a reason, right? Why is she contacting you and going over old history when she's married with a kid?

I guess I'm not really qualified to answer your original question, though, as I haven't reconnected with someone I loathed.