dear Pirana, thank you for being able to post your comment, as sometimes it's so hard to decide whether to or not to, but you have to heal after this relationship.
The love from you can be so strong, which you have shown, but it can not be enough if the other person is suffering from depression, and unfortunately it's in his family, which then makes it so much harder for someone like you.
Your boyfriend does need help and without any of this then he won't be able to control his bipolar, and even pleading with him or even forcing him still won't work unless he wants to do it for himself.
You seem to be such a happy gregarious type person in that there be will love for you just around the corner, and I'm sure you won't have any trouble to find someone else who truly loves you. L Geoff. x