So, here's my thoughts. There's a few distinct possibilities here, and none of them are good for Ralph.
First possibility: Ralph is telling the truth, as is Meigh. In this scenario, Ralph is a piece of shit for sharing this extremely personal story. Also, it only serves to make her seem more sympathetic. I guess it makes her mom seem like a cunt, but that's beside the point; that doesn't somehow negate his abuse, and in fact might actually make it worse, especially if he knew about it before his flagrant domestic abuse.
Final result: total Gunt L.
Second possibility: Ralph is telling the "truth," but Meigh made the story up for some reason. In this scenario, he is still a piece of shit for sharing this story. Even if it is a lie, in this scenario he believes it as truth, which still makes him a piece of shit for sharing it, and anyone that believes it is likely to be more sympathetic to Meigh.
Final result: total Gunt L, and also Meigh L for being a lying cunt.
Third possibility: Ralph is lying and Meigh never said any of this shit. I don't think I need to explain this one at all. It still has all the issues of the first two results, along with the added bonus of him making up a gross fanfic of his wife getting ass raped as a teen.
Final result: total Gunt L, maybe even an absolute L.
You may notice a pattern here: no matter the scenario, the Gunted One always loses. That's because sharing the story of your ex wife getting ass raped, true or not, IS LITERALLY NEVER A WIN. EVER.