Can i somehow help my ex gf after break up?

A bit of background:

I’m non-binary and I’m 15; my ex-girlfriend is 19. We were in a relationship for a year, but it turned out that my feelings for her had cooled and I’d completely lost understanding of my own emotions. She’s a wonderful partner, really, but for about two months I’d only seen her as a friend at most, and yesterday I told her about it. She seemed to accept it, but at the same time she’s really struggling with it, as she loved me deeply, and because of that I feel guilty that I don’t feel the same way as I used to. Is there any way I can support her? I can see how worried she is about this and how hard it’s been for her. (I’m writing through a translator as English isn’t my first language.)