Narcissistic abuse

I know now that I should have gotten professional help when I realized my situation and maybe it’s not too late for me to do so but this has just been buzzing around in my head for the last month.

I’ve been out of a narcissistic abusive relationship since July of 2019 and unfortunately I started a great relationship with a guy that I am now engaged to almost immediately after the hard breakup. It’s been a year and two months but I still find it so hard to believe that anyone, including my amazing fiancé would find me attractive let alone beautiful. I hear him say it all the time to me but I’m still that scared woman from the last relationship who was told she was ugly and unattractive from head to toe. Why is it so hard to see myself the way my fiancé see’s me and not the way my ex did. I’ve been with my fiancé longer than I was with my ex but why does his opinion stick in my head vs someone who actually loves me.