What do you do when you are the red flag? I hate myself.

Heyyyy. First Time posting.

So um. I was making a friend at my new school and after I told him I am Bipolar, he stopped being my friend. He said that his sister is also Bipolar and one of her episodes destoryed his life and made him extremely depressed for a whole year. She spilled some big secret. Sigh. You know people always tell you to avoid red flags. But what do you when you are one? Sigh.