How do I move on from my ex

Long story short, I said something extremely insensitive in the presence of my girlfriend (who is now my ex) and decided to question me about it while I was at work of all places, which led to...quite a few unsatisfactory responses. It's been over 2 weeks now that she's ghosted me, and a little over a week since she's blocked me from everything. I am so depressed without her and it kills me that she's allowing this to destroy our year and a half relationship.... She told me she wanted to be there for me after hearing about the news concerning my father and now I just feel so betrayed and heartbroken.... today was the day my Mom died 7 years ago and I haven't got a single message or anything from her...

What do I do? How can I move on? I love her so much but there's no way we can reconnect again since I'm blocked on everything.... I miss her so much and want her & only her, but.... it's over.... can somebody please help give me advice on how to move on from this?