Betrayed by a promise of marriage. How do I move on and find peace?

Assalamu alaikum. I’m struggling with guilt and sadness over a man who used me for his desires, even though he talked about marrying me and starting a family. When I confronted him, he brushed it off, saying he was just a young, unsupervised guy online and spoke out of lust. I’ve had no one to confide in, so I turned to AI, which keeps pointing out that I was manipulated and taken advantage of. It’s left me in shock. He’s blocked me now, and I’m left wondering if he was preying on me or just a lost soul trying to change. How do I heal, stop blaming myself, and learn to forgive? Any advice, sisters and brothers?