just broke up a bipolar man

I recently broke up with someone who has mentioned that his mother is severely bipolar among other family members and that his therapist said that he was bipolar in relationships. I didnt really take this into account when I got deeper into the relationship. I tried to make it work as long as I can and I felt so trapped. He would be really Happy one moment, wanna see me all the time, asking if i missed him, then all of a sudden he wouldnt talk to me for days, get really angry accusing me of things I never said, to getting really down on himself and being very depressed. It took breaking-up with him for me to start looking into what bipolar disorder is and was astonished to see all the signs, from what Ive just said to the aspect of sexual intimacy. It was like reading what I have been going through for 4 months. Now, I am really caught because I still want to be there for him, but I know that if he's manic, he's gonna feel better than me and if he's depressed., he has no self worth. So should I continue being his friend and check on him from time to time?