Nikkah Called Off - Seeking Healing and Guidance, Assalamualaikum

Assalamualaikum. I was meant to have my nikkah with my ex on January 3rd, but before that day arrived we started having serious problems - lots of emotional strain, miscommunication, and both of us responding in unhealthy ways. It became too much. Our relationship had been largely very haram, and we hoped nikkah would set things right. But then we began facing intense issues together and in our own lives separately. He chose to cancel the nikkah because he felt entering marriage with so many unresolved problems would only make things worse and risk a toxic marriage. Even though it hurt, I can see why he made that decision. And to be honest, part of me is relieved he stopped it. Not because I didn’t love him - I loved him deeply - but because I can now see I had an unhealthy attachment that wasn’t fair to either of us. I relied on him for my emotional stability in a way that made me lose sight of myself and even lose focus on Allah. I also struggled with drugs during our time together because my priorities were misguided. We weren’t ready for a good, halal marriage. Now I’m trying to heal. I’m working on my mental health, reconnecting with Allah, and trying to find myself again outside of that relationship. But it still hurts so much. Some days the anxiety hits me like a truck. I miss him, I miss the future we were planning, and I’m scared about what’s ahead. I pray Allah reunites us if it’s best, and otherwise guides me to what’s right. Has anyone gone through something similar? JazakAllahu khairan for any advice or duʻa.