Parents getting divorced as I’m planning my wedding

Hi all, would love some advice or words of encouragement here. I recently got engaged, and my parents also recently separated. It’s extremely hard for me to navigate such conflicting feelings at the same time — being excited for my future marriage and life with my partner while also mourning my parents’ relationship and my “complete” family unit. I have a lot of anxiety around the whole thing. It’s also hard for me because my fiancee comes from an extremely close and loving family, and I love getting to be a part of it, but he truly does not understand how I am feeling, so it’s hard to confide in him. I am planning on starting therapy soon, because it’s really important to me to work through how to process and navigate my conflicting feelings before I get married, but I also feel like I don’t really have a support system because none of my friends can really understand what I’m dealing with either.