I would be trying to get with her probably, if she's bad, sounds like both of you are heading that direction whether you know it or not.
But, to speak to the question, everyone is going to have different belief systems here, I don't blame anyone for keeping options around, I think it's reasonable, all in the game to me. I don't want or need to know who she still talks to, to me, it's healthy for people to have those outlets, both ways. Many will disagree.
i think there are parts of the traditional relationship structure that make it impossible to be human, and hold people to these insanely high standard of behavior, and analysis, and importance that could never live up to expectations. Anytime someone told me about an exchange they had with a former lover or partner, I was kind of the mind that you don't even need to tell me, do your thing. But men, think that kind of stuff shows loyalty or respect, or something like that, and it probably does, it's just not that important to me.