I used to believe in twin flames, because I was desperate to feel complete. Because I didn't realize that the feeling of incompleteness came from my own dissociative barriers in my own mind.
When I first snapped out of it, it was hard to process, and I certainly wasn't ready to talk about it. What doesn't help is that I didn't fall down the rabbit hole alone. We were both drowning souls, clinging to whatever gave us comfort. We bonded over fandoms, and let our imaginations carry us away to the most ridiculous things. The spiritual things that happened just fueled the fire into an inferno.
We talked it out, and settled things just fine. The drowning souls bit was paraphrased from her. I just have a really hard time not feeling horrified at what could have happened. The possibilities scare me.
Edit: In case this wasn't plainly obvious, I do hate the concept of twin flames. It is completely toxic.