Sorry, its a story we hear all the time, so know you are not alone.
Funny thing when im normal, im straight, when im in a mania, im bi. Sounds like your wife is in a major mania, and only meds can help her find her way back.
You need to focus on yourself, you may love her but this is something she needs to find the answers for herself. No one can make a BP person see the light, its someting they have to find in their selves.
Good luck \
"If Life Gives You Lemons, Make Lemonade" "It isn't my fault that i am BiPolar, It is my responsibility how i treat it so that i don't hurt others or myself." Happy Bill
"Pain comes from wanting things to be different then what they actually are. Peace comes from accepting what is for what it is. Acceptance is the path i follow to peace"