Despite our age difference, my brother (32m) and I (24m) are really close, and I have always looked up to him since high school. Now, coming to his fiancée (34f), he met her 3 years ago at our cousin's birthday party, and they hit it off instantly. He introduced me to her after 3 months; she was funny and beautiful, and they looked like one of those "couples". I admit I didn't like my brother being so close to someone he met 3 months ago, but he seemed happy, so I just wished him luck and didn't say anything then.

Fast forward 2 years; now they're engaged and are planning for a wedding in 2 months (seriously just 2 months after the engagement?). After the engagement day I found out from my cousin that my brother's fiancée has a "history", and she was very sexually active in her 20s. Okay, he pretty much said that her body count could be 20+, and even he dated her for a couple of months before she ditched him for someone (I wouldn't have believed him if not for the photos). I knew he could be lying about the body count or was jealous of my brother, but I just wanted to check whether my brother knows anything about her past.

So the first thing I said to my brother when I met him face-to-face was, "Do you know about her past?" I told him everything and just asked him to think about it because this was just his 4th long term relationship, and he's pretty serious about these things. And unfortunately it didn't go well when she lied about her relationship with our cousin, and now my brother even believes the body count (which she denies). All hell broke loose when she called him a misogynist for judging her "past", and he called her a liar for never being honest about her "past". It's been 3 weeks, and they still haven't talked to each other. AITAH for ruining my brother's wedding?