Struggling with a recent breakup and feeling lost

I just went through a breakup, where the person and I had no contact for a month and then within 4 days of having contact they broke up with me. This was on the 3rd it is now the 25th and they just blocked me a few days ago. She got mad because i posted an instagram post on what would’ve been our three months with the caption of “ •5•22• |a new chapter|” i didn’t think much of it since it was pictures of me and a friend and a hike i had gone in earlier that day. She sent me messages stating she was “glad i was fucking moving on” when i wasn’t and i still haven’t. I don’t know what to do. I feel like every part of me has been ripped away and like a part of me has been taken away. She made me whole and was the love of my life. I’m just wondering why was i such a bad person that her and so many others have left me. Am i the problem? Did i cause all of this to happen and always had it coming for me? idk just overthinking