My boyfriend broke up with me because of my mood swing

So we been together for a year with 2 months gap. But things started to get toxic (started to argue a lot, I blocked him out of the blue one time, he would get upset and overreact at accident mistakes) after 8 months. He would get upset at unreasonable things and wouldn’t believe my explanations and would call it as an excuse. When he got upset at those unreasonable things I would say sorry and explain with compassion, but mostly he would overreact and threatening me that he would stop talking to me or walk out my life. It triggers my anger because he could be upset at me and I would try to understand him but when its him that makes a mistake and its a real issue, he would dismiss my feelings and that I overwhelm him. All I ask was just a basic communication because he would often disappear for more than 10 hours or a day with no explanations and it causes me anxiety and sick to my stomach. He barely changed his way of communication. Next is, he would say things that are hurtful such as “I don’t wanna be that important to you”, “I lost interest because of your overthinking”, “you are hard to deal with”, “I forced myself to get excited when we talk or when I get your text but I feel empty”. The words he said hurt but then if I get upset it would be my fault to overreact because I’m overly sensitive and he would give me a silent treatment after that, its always my fault and he doesn’t think something is wrong with him, he doesn’t even think that the root of the problem is the way he communicates. Four days ago, he made me upset because of constant reminder of my past mistake and I was hurt by the those things, I left him on read and didn’t talk to him the next two days. Three days later, I reached out to him to clear misunderstandings and said sorry because I reacted with emotions. He said it was all my fault for not understanding him but he didn’t even try to understand things from my experience. He acted like he’s the only one that hurt badly. He broke up with me and said he won’t deal with me and my mood swings anymore. I cried 3 days in a row after the issue and cried 5 times in the day we broke up. I don’t know like is that even that very big deal that he needed to cut me off after the amount of time we have spent together? Am I really that bad person? I don’t know I actually think he’s lack of empathy and selfish person and he doesn’t care about me because he wouldn’t cut me off like that over that thing right? Or is it just really hard to deal with? Can someone tell me how shitty he is as a person? Because my brain would still romanticize him and it hurts like hell.