Staying strong for myself and untreated bipolar ex

A year ago I went through one of the worst experiences of mu life (see prev posts) briefly - Partner dissapeared, came home, admitted to hospital, then broke it off with me. My whole world fell apart, he seemed to be coping fine! I did not see any signs of this happening despite being together for 6 years, living together 1. He went to some strange places and said some strange things like it was normal. 3 months later he asked us to get back together, I still loved him so said yes. A year down the line I found that I could not forget things, he expected me to just get back to how we used to be and still talked like what he did was ok and I should trust him again. I tried to talk to him about being Bipolar and seeking help, he told me he wasn't bipolar and that he had sorted everything out those 2 nights he dissapeared. I tried to say that if there was nothing wrong with him then I have to belive that what he said and did to me he meant......I knew this would make him think. I left it a couple of weeks, depsite him telling me he would talk to someone, he didn't. I was seeking help for myself to get over the last year but he was doing nothing. I had to make the heart breaking decision that I had to finish it with him. To have a future things had to change and he was not doing anything. I love him with all my heart but by me standing by him, I was not only not helping him but I was not helping myslef. It's been 2 weeks since I spoke with him last. I love him but perhaps I have to let him go