Confession of a bachelorette

This is not my confession, but a good friend. I am in a situation where I'm keeping a secret that's a real giant. My friend 'Samantha' and I have been close since high school. She met a good guy several years ago. It got serious, and now they're engaged. She was one of those girls who always wanted a magic wedding, so she has been a bit of a bridezilla. They had a good sex life, according to them both. She wanted the wedding night and honeymoon to be really special, so she decided that they would abstain from sex for the entire six-month engagement. He protested, but it she decided for them both. This was hard on them, and they'd been frustrated and cranky. With two months to go, we had a bachelorette party. We went to a few nice clubs and did the normal drinking too much. She was dancing with several guys, which I guess is a grey area but not uncommon. Then, she went home with one of them. We tried to stop her, but she was very set on this guy. So, she had 'an amazing time' according to her. I thought this was BAD, but just a one-time thing. Well, it wasn't. She's been having regular sex with this guy all the time. She is infatuated with him, although she says it will be over when she gets married. She's just 'having fun' right now. Well, her fiancé is burning and craving her touch. He keeps begging for 'at least a blowjob'. She loves his yearning and laughs about it to all of us. He's desperate and begging and she seems to be really turned on by that (I get it, I'm the same way with guys begging). But she's having all the great sex she can handle and teasing her fiancé relentlessly. She keeps taunting him about not getting any, and she pretends to be frustrated too. He obviously doesn't know and there's about five of us keeping her secret. I hope this is temporary and she comes to her senses when she marries.