ex gf broke up with me. Got back together and blocked me randomly after 3 days, what should I do?

First of all take a deep breath. Relax. And remember that while it hurts now, it gets better. I'm not sure why she would hurt you this way, but the good news is that you see her true colors now and now she isn't the right one for you. The right girl will come and you won't have to worried about her ghosting you because she'll be waking up next to you

That must be leaving you feeling confused and upset. Has she been doing things like this a lot? Have you felt like you can talk to her lately? Or has that been something that has also changed lately? I know that this is a difficult situation to approach and solve, but we're here for you, to give you support. You can tell us here whatever you think the right move would be, and we'll listen carefully and validate whatever you might have to say. I could offer advice from my personal stance but I don't think that would be helpful to you.