Oh... How sad it is to read the poems about your love for your ex. :((( You shouldn't cringe though. Your feelings were authentic, and vulnerable, and beautiful. Unfortunately he didn't appreciate them. But that doesn't mean you were wrong for having or expressing the feelings.

I cringe sometimes when I think about a gushy letter I wrote to the first woman I'd ever fallen in love with. And how she ghosted me a few months later. But that said, I wasn't wrong to have the feelings or to express them.