If they trust you, give them a reason not to
It takes a lot longer to build trust than it does to destroy it. And what’s the purpose of gaining your boyfriend’s trust only to exploit later on? It seems completely unnecessary and not to mention a huge waste of time. If you exploit your boyfriend once and he catches on, it’s pretty much over. All of that trust-building for a single play.
We don’t know who this woman is, but she’s definitely off her rocker. The internet has given a platform to pretty much every dimwitted person with charisma. This is a terrible person that nobody, man or woman, should listen to.