Should we get back together?

My ex boyfriend and I were together for a year and a half when I broke up with him. I broke up with him 6 months ago because for the last year, he kept letting his insecurities cause problems for us. He couldn’t get over my past experience whether it be in relationships or sexually because he hadn’t had any experience in those departments before dating me. He kept holding one specific situation over my head and it got to the point where it was unbearable and I was more unhappy than I was happy. It took me a while to realize but I contributed to the unhappiness too and had to work on myself a bit as well. I gave him too many chance to fix his end but he never really stepped up and tried until after we broke up. He’s been in therapy for around 6-7 months now and seems to be doing a lot better. We go to the same university. I don’t see him very often but we occasionally hang out since we have some of the same friends but when I do see him, I miss him so much more than I already do. I think about him every day, all day. Even though for the past 4 months I’ve been seeing other people and trying to move on, no one compares. I love him so much and just wish we could make things work. I’m not sure what to do. I know our relationship was toxic but I feel like if he’s made a substantial enough change maybe it won’t be this time. I feel like I’ve made the changes necessary on my end but I’m not sure if he has and I know I shouldn’t get back with him if those necessary changes aren’t made. Should I talk to him about getting back together? Should I wait it out and maybe hang out with him a bit more to feel out the situation? Or should I completely let it go?