Can’t seem to move on from my ex fiancé. We were together for 9 years

I broke off my engagement from my fiancé February 2018 and moved out of our apt that we shared together. For several months he tried to mend our relationship and all of the sudden his persistence turned to anger. It was almost as thought as soon as I was open to reconciling he changed. We were together for almost 9 years. The last month that we were together it was hell. He gave me the silent treatment; he was very verbally argumentative. We constantly fought about the budget for the wedding. We couldn’t resolve any issue we faced and our sex life was non existent. Prior to me he had a great sex life unlike me he was the only man I had been intimate with. I wanted to explore and be intimate with him he really held back. When I would tell him how frustrated I am about our sex life he’d say “I can’t make love with you and my heart is questioning our relationship” he felt getting married would magically fix our communication problems. I didn’t want to commit myself for a lifetime when I see that we have horrible communication and a non existent sex life. 8 months later here I am missing him more than ever. He sent me a text this Monday saying that he still can’t believe it to this day that I walked out. That’s what he’s been texting for the last several months. Should I try and mend this or move on?