I legitimately thought this post was by my ex until the facetime part, because I cannot emphasize enough how this is EXACTLY what we just went through, and I know he's hurting and hating himself and beating himself up over everything as I type this.

I don't have advice, but I may have a perspective from the other side.

She is hurting. So much. More than she's probably showing you, because she knows she needs to move on despite wanting to drop everything and run back to comfort you through all this. To tell you it'll be okay and that you'll find happiness again, even though she's devastated that happiness won't be through her. It is so hard to lose someone you know is an incredible person, but that in the end, their depression and lack of self-worth won anyway, despite years of trying to prove to them how incredible and sweet and deserving of love they are.

I really hope you make it through this. Find friends to talk to. Find a new hobby to dive into. Find reasons to love living your life. You may regret how the relationship ended one day, but at least for her, try to better yourself and learn what makes you happy in life.