I need advise

I have a friend who wants to have a serious relationship with me, he has talk about his feelings for me. But he is bipolar and refuses to accept his diagnose, lately he has gone through very difficult manic episodes, where he confessed to his boss about taking marihuana and mushroom while working, he also shoot his TV because the guns made him feel safe. I'm scared I don't share the same feelings, and my mom it's also bipolar and I don't want to go through that path again, it was very difficult and exhausting. At the same time, I feel a horrendous friend, he doesn't have many friends, after his divorce he went through depression. I don't know what to do.