I recently reunited with a former high-school girlfriend and we’d been having a great time until I told my asshole brother about her a few weeks ago. He flippantly responded that he’d had sex with her shortly after she and I broke up. I’ve asked her about it and she says that although they dated a few times, they never slept together. I honestly don’t know who’s telling the truth, and it’s bothering me a lot. Now it’s hard to take her seriously, like I can’t imagine bringing her to a family function anymore.