I would never date someone who took lithium or any other psycho-active medication. In fact, I would keep my distance from anyone like that - boss, acquaintance, etc. I simply don't want to have to deal with that stuff. That doesn't mean I'm traumatized as a result of having some sort of experience with someone on psychoactive drugs. I also wouldn't go near anyone who took recreational drugs (smoked weed, etc.) Again, it's not because I've ever associated with people who do those things.

I had a friend once who got married. After she got married, she discovered that her new husband took Lithium. She was furious that he hadn't told her, because if he had, she would not have dated him, never mind married him.

So my question to you is this: Did she genuinely have trauma, a meltdown, a breakdown when she saw that? Or did you want her to stay and she didn't want to?