Remember:
The first order of business of any grifter over the long run is not to gain your trust, but have you compromise your own integrity. That way, in your own mind, you become like them, and when your trust is betrayed, you think you deserved it, or worse, you fall into league with the grifter.
In the Cold War days, there was a term for this: #kompromat. Don't become a #kompromat