Why does being blocked hurt so badly?

I know she still cares, but I want to be unblocked. I was the one who broke up with her but it was due to feeling like she didn’t like me enough. That probably stemmed from my own insecurities. But I talked to her at some point and admittedly I did lash out at her and yelled at her and then I got blocked.

Obviously that was my fault but I feel like it’s crazy to leave me blocked. I used a strict tone with her but I don’t think anything I said was truly hurtful. I don’t think it warranted blocking. It’s been 8 months and I just want to be unblocked. The thought of being blocked forever brings me a lot of shame, especially because I’ve been blocked for years by another girl (who I no longer care about) and it’s shameful that I also got blocked by this one. Clearly I need to work on how I respond to being hurt but being blocked this time hurts even worse than the first time since I never dated the other girl but did date this one. I need to control my emotions better to avoid being blocked but still.