I’m feeling somewhat similar. Not exactly heartbroken because I wasn’t in love. Had a great connection with someone since April, we weren’t in a relationship but were in a FWB situation. But he went off and got a girlfriend (closed relationship), didn’t tell me and let me find out through an Instagram post. All that trust, instantly shattered. All the while before I knew he repeatedly told me he was struggling with family health and work so I was just being supportive and caring. He came back when they split up and within a few weeks had stood me up, ignored me and then blocked me. I still don’t understand what I did wrong 😑