Called Off My Engagement Before Nikah - Dealing with Guilt and Worry About a Dua

Salaam, everyone. I'm a brother who connected with a sister online with marriage in mind. Things progressed, our families got involved, and we got engaged. I have to be honest-I messed up in how I handled the talking stage and didn't keep the right Islamic boundaries. I truly regret it and have sought forgiveness from Allah. After we finally met in person and I had time to think deeply, I realized I just wasn't feeling that connection or a sense of peace and certainty about going through with the nikah. I was worried that pushing ahead with these doubts could cause bigger issues down the road in the marriage. So, I made the really tough choice to end the engagement before the nikah. I didn't go into details about the attraction part because I didn't want to cause deeper hurt. I just explained that I didn't have that inner peace to move forward. She was deeply upset, and her mother was very angry and made a dua against me, saying I'd never find happiness. This has been really heavy on my heart. I keep wondering: - If I've sincerely repented, should I still be so worried about that dua made against me? - Was it Islamically wrong to stop things at the engagement stage because I lacked that attraction and certainty? - Is it better to step back before the nikah if you're unsure, even though it causes pain? JazakAllah khair for any advice.