My Slut Sister

I have a sister, helen who is 27. She is married to a great guy, who admitted he was a virgin when they met, she was then 20. She told him the same before they started having sex. It was all bullshit. She lost it when she was 12 to an 18 year old guy. She was doing gangbangs and anal, all oral gangbangs and fucked anyone who took her out on a date. I remember her saying that before she got married at 22 she wanted to get her number up to an official 200.

the problem is that she lied to him and he is a super great guy, literally struck it rich and I found out my slut sister is still fucking around on him. I really like him, he is cute, in great shape, a great husband and I'm sure totally loyal to my sister. But she lied so much to him it's craxy. She did get to 200 guys before she got married, the last 10 were a gangbang the night before her wedding. She is such a slut but got all the good stuff in life. I don't understand it.