Is it wrong if I talk to a girl I barely know about this?

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In my opinion, it's ludicrous for this sort of situation to occur at that age. Heck, I'm going into 8th too, and not only do I not have an ex, I don't even have a GF (nor have I ever).

In any case, that isn't a good idea. She'll be hostile towards you even if she's his ex, and if their breakup was painful, she may feed you false information just to ruin him in your eyes. It is much better to observe him from afar for a little while, and then perhaps actually GET TO KNOW HIM at least a bit before making any decisions or moves.