Well first up, I don't think there is a right or wrong way to break up with someone. There is a easy way and a hard way. (The hard way being where you get into a serious fight and everything comes out.)

Now onto the subject at hand. I don't think that we should ever delve into our S/O's past too much. The reason for this is, it can cause unwanted tension and put the r/ship under serious strain. In particular if you did ring any of their ex's, will they be forthcoming or just tell you that you are a nosey so and so?

There is no point in dragging the r/ship through the mud if you don't need to. If you are happy with your S/O then what does it matter about their past? Live and let live I say.

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