Women are taught these days, that all men are pervy rapist scumbags that are a part of this invisible non-existent male patriarchy. So there's a lot of women that eat that **** up like a full on cultist, and therefore don't see men as people. That or/and they're taught to use men for whatever they want, then discard them afterwards.
I find it best to do things on a case by case basis though. I've been taught countless times that people are expendable in this society. So I have no ties to anyone and I consider anyone that comes into my life to be temporary unless they prove otherwise. But don't get your hopes up when it comes to other people, because 9.8 times outta 10, they'll let you down in the short term, and 9.99 times outta 10, they'll let you down, and/or ditch you off entirely in the long/medium term.