Anxiety and depression due to ex replacing me but she has depression too?

This entire situation has been so confusing. We broke up in January due to her depression. She told me to wait for her to get better so we can get back together someday. Throughout the rest of January and February, she got worse and I was there for her or I at least tried to be. I tried to improve myself during this time while being there for her. I would be there for her and she would not respond for a few days. We saw each other a few times and still hugged/kissed. Her cat passed away and made it worse, I was there to bury her cat and I was there for her. Again, she disappeared for a few days but I understood. Then she FaceTimed me and showed that she shaved her head and just doesn’t care about anything anymore, she still looked so beautiful. We fell asleep on call and it felt like when we were together. The call hung up and she disappeared. The next day I see she’s with someone new. Photo of them hugging. Literally the day after we called. This broke me and reset my progress. I was there for her and she randomly cut me off and is with someone new? I’ve been depressed again and haven’t got out of bed much.