Is NOBODY wrong in the post ? POST : So a little background info; I was dating this girl about a year back and we had a mutual friend whom she had introduced me to. This friend, let's call her Stephanie, was down with clinical depression and dropped out of school so she didn't have any friends except for the girl I was dating back then. However the girl and my relationship was very toxic, and both Stephanie and I realised that too late. I finally broke off with the girl and Stephanie cut her out as well. 

After that, I was basically lost and alone as well. We were both at our lowest since she lost her only other friend and we both only had each other to fall back on. We tried our best to support each other and all, but after some time I got busy and wasn't able to keep in contact with her as much. During this time, she's made a huge improvement with herself, finding many new friends and even having a close circle of friends (according to what I see on social media), all while I was busy with school. 

It's been half a year since I have had a real conversation with Stephanie. It was her birthday recently and I was disheartened to find out that she held a party without sending me an invite. I felt angry because I was there for her at the times she was at her lowest. She was also always there for me, when I got busy I did try my best to keep the friendship going but I didn't feel the effort from her anymore and we'd go for weeks or months without contact. She's basically forgotten me, and because of this I cut her off from my life without telling her. I'm happy for her and all, that she's found friends, but I feel very underappreciated in this situation and i'm not the kind of guy who deals very well with my emotions, especially in situations like these.

Am I the asshole for cutting her off?