There is a friend of my wife, a cute girl a few years younger than us, and she met her current boyfriend a little less than 2 years ago (I think - I don't pay attention to this shit).
He's a nice kid, even younger than she is, works hard, has a decent job, and is getting ready to propose to her. But he's a complete beta. She's his second or third girlfriend, at most. Very emotional, very attentive to her needs/wants/feeeeelings.
Now this girl tells my wife everything. Girl is total alpha widow. She partied, dabbled in many drugs, and hopped on every athlete cock in the university. Sometimes several cocks at the same time. After, she walked into a high paying job due to family connections. Now she professes her love for this guy but still keeps in contact with the alpha caveman who rutted her into oblivion for a two year period after college (while never agreeing to be exclusive). And she tells my wife that she and the current boyfriend are a great match because neither of them need sex. They have sex maybe once a month and they rarely "finish" because it's just not that important. And she made it very clear that any masturbation on his part, any at all, is grounds for breaking up.
I'm very tempted to sit him down and explain a few things about women and specifically about his girlfriend. She gave it up in delightfully depraved ways to other guys but isn't going to touch him until she wants a baby. My wife prefers that I stay out of it, and maybe that's the best course of action. I just have a hard time watching a car crash happening right in front of me.
Should I mind my own business?
TL:DR; I'm debating whether or not to warn a beta about his girlfriend's history.