My Du'a Might Be Answered and I'm Losing My Imaan - I Need Help

Assalamu Alaikum. Since October 2024 I've been making constant du'a to marry someone I really liked. I hadn't met them personally at first, but we have mutual family and I knew of them. The more I heard, the more I liked them and I used to imagine our life together after nikah. He lived in another country, like my cousin, so I travelled to visit my cousin and hoped to catch a glimpse of him in person. By chance I saw him from afar - I didn't approach or contact him. After I returned home I found his profile on a matrimony app and we matched. He said he'd visit to meet my family after two months, but that never happened. Since then I've fallen into a deep low - constant sadness, not enjoying things, thinking about him every day for a whole year. I know it sounds like I might need professional help, but all I did was turn to Allah: frequent du'a, waking for Tahajjud, praying even at work when I could, and crying when I knew I'd miss salah while travelling. I was so focused on my salah. Recently I learned he might be getting married or already is, and I felt completely crushed. My head aches, my heart is heavy, and I've been missing prayers during the day even though I try to make them up at night. I no longer wake for Tahajjud. I let go of many suitable proposals because I believed Allah would bring this to me. I still say astaghfirullah and I do believe Allah's decree is best, but I'm sad and disappointed - like my du'a wasn't enough. I'm trying to be diligent with my salah again but I'm afraid I'm losing faith, astaghfirullah. I just can't seem to care the way I used to. I know this reads like a rant, but I'm honestly asking for advice and dua. How can I rebuild my relationship with Allah, find peace with what happened, and move forward when I feel so stuck? Any practical steps or personal experiences would mean a lot. JazakAllahu Khayran.