I (26f) last dated a guy who was mentally ill and i regret it so much

Never , in my entire life, have I been so excited about dating a guy. He was a "nerd" type, so genuine and caring. Unfortunately, he had Bipolar and depression. I was adamant on making the relationship work. <br><br>He was so sweet and genuine. He had a good job, was neat and just genuinely care about my well being. But his mood swings were not for the faint of heart. I thought I could handle it.<br><br>I just broke down and left him after last month. I was mentally drained and felt like he used me last time his girlfriend committed suicide. I don't even know who or what he is. I will not lie it was a miracle he was my first long term relationship. I feel like I failed him and I shouldn't have left. But I have to be strong for myself to move on.<br><br>I'm just so worried he will kill himself, but I feel like I can't go back to him. I can't live this way and it does feel better without his negative vibes in my life. I do not understand why mentally ill people are allowed to date.