Ah, love - you are having a rough old time of it. Do you know what would help? You could really do with some counselling and therapy. You're not weak, or stupid or a drama queen. You just need helping unpicking where you are, right now.
Growing up with a bipolar parent can leave you with horrible issues. Certainly it teaches you that feeling insecure is normal, along with being around people who are unpredictable, manipulative, angry, verbally and physically abusive - all normal.
It's no good people telling you that it isn't right or normal, because tbh, to you; it is. It is bloody normal. It's what you know and weirdly, it's what you are comfortable with. It took me ages (and a whole heap of therapy to understand that, and it pisses me off to this day).
Your boyfriend is a symptom. It's time to look after yourself. Go and get some help to work out what is going on. You don't have to leave him - you don't even have to think about it, yet. You just need to find someone that will listen and help you without pressure. You know you're not happy and that this shit isn't right. That's a good step in the right direction. It shows that you are capable of self analysis, but you have to be brave and go further.
You could try Women's Aid 0808 2000 247 , just to talk through what's going on now. They're pretty good.
If you can go private, then find a counsellor BACP is a great resource.
Or go to your GP. But do something - for yourself. Because you deserve better, love. Even though it feels like you don't.