Well, Jon_Dahl, you say the crazy woman got mad at you and the relationship cooled off after you showed her that you had access to other (presumably attractive) women in bikinis? Are you 100% sure this was her trying to reel you in for her weird fetish? That's how it sounds like to me. I think she got pissy you neither took the bait and were talking to other women. Even if the Brazilian friend didn't mean to send you the picture in a flirtatious way, I think Weird Friend took it that way.

Your Brazilian friend was putting it mildly by calling her nuts.

As for you, WarKitty, I think you are in a difficult position. I wish I had more advice, but I do not. But I do wish to say that I hope you find a way to get some help that works for you. If anything, try to frame having the person with you as that you feel like they have valuable input and might help you phrase things? You can reveal the truth later. I think a good one would understand.