I need help.

Hi all. So my boyfriend is diagnosed with BPD (bipolar personality disorder) and is borderline. He’s been diagnosed since long before we were together and I was aware of this once we began dating. We are a year and a month in this relationship and it’s beginning to really take a toll on me and the relationship. He does his best but it’s not working and I’m terrified this relationship won’t either. I love him, I know he’s a good man, but I need advice or help or any type of suggestion on what I can do or how I can help someone with this disorder. I just want to make this work. TIA girls.