Hey Hun, sure we've done things in our earlier years that we aren't proud of today after we did some growing up. Bipolar is instincts run amuck or on overdrive. I feel that ones morality and ethics will stop a person from doing that which they don't want to do. Like, I never cheated on my partner. Sure the thought has jumped into my head with extreme lust, but I knew that its not me and I'd never do it. It's really hard for me to say more than that because my alters have different ideas and when they are up front, no telling what happens or what gets bought, but just no cheating.
Getting a stabilizer though will center you more so you won't be participating in extreme behavior as long as you stay in treatment. Get well.