Will This Interfere With Our Relationship?

Today my boyfriend learned.. He's bipolar. When he told me I felt super down because he never really showed too much that he was. It may not be a big issue but just afraid it'll affect us in a bad way. I told him that I was gonna still be with him every step of the way & I wasn't going to leave. I never wanted him to end up like this. I also told him I was going to continue to try & make him happy. He said, "Sometimes you can't make me happy but its not you baby. Its this stupid brain." I wanna cry .. Because I feel like now it'll be harder to keep him with me. I feel hopeless. I love him so much & I'm hoping I can be some help to him in whatever. Anyone else been through something like this? I feel alone in this situation. I already suffer from bad anxiety. I don't want it to get out of hand.. He's gonna begin to take medication as well.. ? Will they help? Anybody else bipolar? & Can tell me if they've changed in their relationship?