He Doesn’t Understand

Hi, I am a teenage girl and suffer am type 2 bipolar. I told my boyfriend a little while ago and he just still doesn’t get it. I am really struggling lately and he seems to not care. He even cheated on me and somehow is back in my life and still not caring. He is really a good person, but I feel like he doesn’t understand my symptoms and even gets mad at me when I don’t act “normal”. I don’t know how to make him understand what I’m going through. HELP!